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Dissertations / Theses on the topic 'Tunable photonic crystals'

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Published: 10 March 2023

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1

Fan, Yun-Hsing. "TUNABLE LIQUID CRYSTAL PHOTONIC DEVICES." Doctoral diss., University of Central Florida, 2005. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/3926.

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Liquid crystal (LC)-based adaptive optics are important for information processing, optical interconnections, photonics, integrated optics, and optical communications due to their tunable optical properties. In this dissertation, we describe novel liquid crystal photonic devices and their fabrication methods. The devices presented include inhomogeneous polymer-dispersed liquid crystal (PDLC), polymer network liquid crystals (PNLC) and phase-separated composite film (PSCOF). Liquid crystal/polymer composites could exist in different forms depending on the fabrication conditions. In Chap. 3, we
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2

González, Xavier (Xavier R. González Barrios). "Edible photonic crystals tunable within the visible regime." Thesis, Massachusetts Institute of Technology, 2010. http://hdl.handle.net/1721.1/112496.

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Thesis: S.B., Massachusetts Institute of Technology, Department of Materials Science and Engineering, 2010.<br>Cataloged from PDF version of thesis.<br>Includes bibliographical references (pages 50-52).<br>An experimental study was performed to design and fabricate an edible photonic crystal made of alternating layers of food grade titanium dioxide and agar that is able to selectively reflect wavelengths of light within the visible spectrum and allow for dynamic color changes through the tuning mechanism of swelling its agar layers with the addition of edible solvents. After doing a literature
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3

Wong, Chee Wei 1975. "Strain-tuning of periodic optical devices : tunable gratings and photonic crystals." Thesis, Massachusetts Institute of Technology, 2003. http://hdl.handle.net/1721.1/17008.

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Thesis (Sc. D.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2003.<br>Includes bibliographical references (p. [161]-173).<br>This electronic version was submitted by the student author. The certified thesis is available in the Institute Archives and Special Collections.<br>The advancement of micro- and nano-scale optical devices has heralded micromirrors, semiconductor micro- and nano-lasers, and photonic crystals, among many. Broadly defined with the field of microphotonics and microelectromechanical systems, these innovations have targeted applications in integra
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4

Rey, Isabella H. "Active slow light in silicon photonic crystals : tunable delay and Raman gain." Thesis, University of St Andrews, 2012. http://hdl.handle.net/10023/3356.

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In the past decade, great research effort was inspired by the need to realise active optical functionalities in silicon, in order to develop the full potential of silicon as a photonic platform. In this thesis we explore the possibility of achieving tunable delay and optical gain in silicon, taking advantage of the unique dispersion capabilities of photonic crystals. To achieve tunable optical delay, we adopt a wavelength conversion and group velocity dispersion approach in a miniaturised engineered slow light photonic crystal waveguide. Our scheme is equivalent to a two-step indirect photonic
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5

Lu, Shin-Ying. "Electrically-tunable Colors of Chiral Liquid Crystals for Photonic and Display Applications." Kent State University / OhioLINK, 2010. http://rave.ohiolink.edu/etdc/view?acc_num=kent1279299037.

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6

Welna, Karl P. "Electrically injected photonic-crystal nanocavities." Thesis, University of St Andrews, 2011. http://hdl.handle.net/10023/2528.

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Nano-emitters are the new generation of laser devices. A photonic-crystal cavity, which highly confines light in small volumes, in combination with quantum-dots can enhance the efficiency and lower the threshold of this device. The practical realisation of a reliable, electrically pumped photonic-crystal laser at room-temperature is, however, challenging. In this project, a design for such a laser was established. Its properties are split up into electrical, optical and thermal tasks that are individually investigated via various device simulations. The resulting device performance showed that
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7

Li, Jun. "REFRACTIVE INDICES OF LIQUID CRYSTALS AND THEIR APPLICATIONS IN DISPLAY AND PHOTONIC DEVICES." Doctoral diss., University of Central Florida, 2005. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/2200.

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Liquid crystals (LCs) are important materials for flat panel display and photonic devices. Most LC devices use electrical field-, magnetic field-, or temperature-induced refractive index change to modulate the incident light. Molecular constituents, wavelength, and temperature are the three primary factors determining the liquid crystal refractive indices: ne and no for the extraordinary and ordinary rays, respectively. In this dissertation, we derive several physical models for describing the wavelength and temperature effects on liquid crystal refractive indices, average refractive index, an
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8

Kovalevich, Tatiana. "Tunable Bloch surface waves devices." Thesis, Bourgogne Franche-Comté, 2017. http://www.theses.fr/2017UBFCD022/document.

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Cette thèse est consacrée au développement de dispositifs accordables sur la base de cristaux photoniques unidimensionnels qui peuvent supporter des ondes de surface de Bloch (BSW). Tout d'abord, nous explorons les possibilités de contrôler la direction de propagation des BSW par le biais de la polarisation de la lumière incidente. Dans ce cas, nous gravons sur le dessus du cristal photonique 1D des structures passives de type réseau, qui permettent à la fois de coupler la lumière incidente aux BSWs et de se comporter comme une lame séparatrice ultracompacte contrôlée par la polarisation lumin
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9

John, Jimmy. "VO2 nanostructures for dynamically tunable nanophotonic devices." Thesis, Lyon, 2020. http://www.theses.fr/2020LYSEI044.

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L'information est devenue le bien le plus précieux au monde. Ce mouvement vers la nouvelle ère de l'information a été propulsé par la capacité à transmettre l'information plus rapidement, à la vitesse de la lumière. Il est donc apparu nécessaire de mener des recherches plus poussées pour contrôler plus efficacement les supports d'information. Avec les progrès réalisés dans ce secteur, la plupart des technologies actuelles de contrôle de la lumière se heurtent à certains obstacles tels que la taille et la consommation d'énergie et sont conçues pour être passives ou sont limitées technologiqueme
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10

Dorjgotov, Enkh-Amgalan. "Tunable Liquid Crystal Etalon and Photonic Devices." Kent State University / OhioLINK, 2010. http://rave.ohiolink.edu/etdc/view?acc_num=kent1278035084.

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11

Du, Fang. "LIQUID CRYSTAL MATERIALS AND TUNABLE DEVICES FOR OPTICAL COMMUNICATIONS." Doctoral diss., University of Central Florida, 2005. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/3375.

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In this dissertation, liquid crystal materials and devices are investigated in meeting the challenges for photonics and communications applications. The first part deals with polymer-stabilized liquid crystal (PSLC) materials and devices. Three polymer-stabilized liquid crystal systems are developed for optical communications. The second part reports the experimental investigation of a novel liquid-crystal-infiltrated photonic crystal fiber (PCF) and explores its applications in fiber-optic communications. The curing temperature is found to have significant effects on the PSLC performance. The
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12

Nishizawa, Norihiko, Youta Ito та Toshio Goto. "0.78-0.90-μm wavelength-tunable femtosecond soliton pulse generation using photonic crystal fiber". IEEE, 2002. http://hdl.handle.net/2237/6769.

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13

Garner, Brett William. "Multifunctional Organic-Inorganic Hybrid Nanophotonic Devices." Thesis, University of North Texas, 2008. https://digital.library.unt.edu/ark:/67531/metadc6108/.

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The emergence of optical applications, such as lasers, fiber optics, and semiconductor based sources and detectors, has created a drive for smaller and more specialized devices. Nanophotonics is an emerging field of study that encompasses the disciplines of physics, engineering, chemistry, biology, applied sciences and biomedical technology. In particular, nanophotonics explores optical processes on a nanoscale. This dissertation presents nanophotonic applications that incorporate various forms of the organic polymer N-isopropylacrylamide (NIPA) with inorganic semiconductors. This includes
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14

Oliveira, Marcus Vinicius Nunes de. "Estudo de operaÃÃes lÃgicas atravÃs da modulaÃÃo por posiÃÃo de pulso no domÃnio da frequÃncia (PPFDM) em AOTF convencional e baseado em fibra de cristal fotÃnico." Universidade Federal do CearÃ, 2014. http://www.teses.ufc.br/tde_busca/arquivo.php?codArquivo=11498.

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Neste trabalho, propomos um novo mÃtodo de modulaÃÃo Ãptica usando um filtro acÃstoÃptico sintonizÃvel (AOTF) convencional e um filtro acÃsto-Ãptico com polarizaÃÃo sintonizÃvel (AOTPF) baseado em fibra de cristal fotÃnico (PCF), onde portas lÃgicas Ãpticas E e OU sÃo obtidas pela operaÃÃo simultÃnea da modulaÃÃo em dupla banda lateral Ãptica (ODSB) e da modulaÃÃo por posiÃÃo de pulso no domÃnio da frequÃncia (PPFDM). Estes dispositivos sÃo operados com pulsos sÃlitons ultracurtos de 100 ps e 55,5 fs para o AOTF convencional e para o AOTPF baseado em PCF, respectivamente. Desta forma, um pulso
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15

Arsenault, Andre C. "Chemically tunable colloidal photonic crystals." 2007. http://link.library.utoronto.ca/eir/EIRdetail.cfm?Resources__ID=968442&T=F.

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16

Chen, Zeguo. "Tunable topological phases in photonic and phononic crystals." Diss., 2018. http://hdl.handle.net/10754/627143.

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Topological photonics/phononics, inspired by the discovery of topological insulators, is a prosperous field of research, in which remarkable one-way propagation edge states are robust against impurities or defect without backscattering. This dissertation discusses the implementation of multiple topological phases in specific designed photonic and phononic crystals. First, it reports a tunable quantum Hall phase in acoustic ring-waveguide system. A new three-band model focused on the topological transitions at the Γ point is studied, which gives the functionality that nontrivial topology can b
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17

Zhang, Nai-wen, and 張乃文. "Negative refraction of tunable elliptical-rod photonic crystals achieved by liquid crystals." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/41444520142353213370.

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碩士<br>國立成功大學<br>機械工程學系碩博士班<br>96<br>Photonic crystals (PhCs) are synthetic periodic structures that,when suitably designed, have the ability to change the propagation of light. Recently, it was proved that the diffraction effects of PhCs can produce the effective negative refraction or the negative index. Hence, the studying of PhCs is not limited in the band gap region. The anomalous refractive properties (especially negative refraction) of PhCs have become hot topics of scientific research over the past few years. In this thesis, the plane wave expansion method is used to get the equifreq
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18

Shih, Chih-Chang, and 施志昌. "Study on magnetically tunable metallic terahertz wave photonic crystals infiltrated with liquid crystal." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/43421200307249105151.

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19

Chang-HongWu and 吳承鴻. "optically tunable photonic crystals base on blue phase liquid crystals doped with azo-chiral material." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/rb88yf.

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20

Bellis, Isabella De. "Photonic crystals based on smart polymers. A new route for tunable devices." Doctoral thesis, 2021. http://hdl.handle.net/2158/1236030.

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The results of this Ph.D. thesis demonstrate the tunability of photonic platforms by introducing stimuli responsive polymers as constituents of the photonic structure itself or as thermally driven mechanical actuators. In particular, liquid crystalline networks (LCNs) were patterned by lithographic techniques, such as direct laser writing (DLW) and UV polymerization to develop and fabricate tunable photonic crystals for different applications, from tunable telecom filters to tunable structural colors and intelligent sensors, featuring good optical properties that can be controlled and modulate
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21

Sun, Mao-Guo, and 孫茂國. "Fabrication of Alternative Plasmonic Materials and Design of Tunable Tamm Plasmon by Hybrid Photonic Crystals." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/98437272798590609769.

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碩士<br>國立交通大學<br>影像與生醫光電研究所<br>105<br>Optical Tamm state is a localized surface mode that plamonic resonance occurred at the boundary between a photonic crystal and metal. Conventional optical Tamm states have been used distributed Bragg reflector (DBR) as the photonic crystal. By varying the thickness of the top layer of DBR or making DBR porous, it could possibly tune the resonant wavelengths. However, it is very difficult to control the quality or modify the thickness of DBR after a sample is fabricated. In this thesis, we choose 3D photonic crystal fabricated by nanosphere to replace DBR to
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22

Hsieh, Hao-Yu, and 謝濠宇. "Integrated Intensity Tunable Optical Filter and High-efficiency Acousto-optical Interaction Based on Photonic Crystals Nano-beam Structure." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/73611532835768118754.

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23

Li, Guan-Huei, and 李冠輝. "Tunable photonic crystal waveguide based on liquid crystal." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/51739561733198217895.

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24

NOCENTINI, SARA. "Tunable polymeric photonic structures." Doctoral thesis, 2017. http://hdl.handle.net/2158/1088792.

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In this work is demonstrated how, combining soft materials and photonic structures thank to a 3D lithographic technique, is possible to create microstructured polymeric photonic devices able to reconfigure their photonic properties under a remote light stimulus.
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25

Schaub, Dominic Etienne. "Dynamically Tunable Photonic Bandgap Materials." 2010. http://hdl.handle.net/1993/4275.

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Photonic bandgap materials are periodic structures that exclude electromagnetic field propagation over frequency intervals known as bandgaps. These materials exhibit remarkable wave dispersion and have found use in many applications that require control over dynamic electromagnetic fields, as their properties can be tailored by design. The two principal objectives of this thesis are the development of a liquid crystal-based microwave photonic bandgap device whose bandgap could be tuned during operation and the design and implementation of a spectral transmission-line modeling method for band s
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26

Guo, Chao-Jie, and 郭朝傑. "Tunable Photonic Crystal Wavelength Division Multiplexer with Liquid Crystal Defects." Thesis, 2006. http://ndltd.ncl.edu.tw/handle/52433621534845304328.

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碩士<br>國立成功大學<br>機械工程學系碩博士班<br>94<br>Two dimensional photonic crystal slabs have formed photonic band gap that forbids wave propagation. With the defects in photonic crystals, the defect modes will be found at a resonance frequency within the photonic band gap. Photonic crystal waveguides and cavities are the two fundamental devices used to spatially localize the light in a planar photonic crystal. We design a channel filter of a two dimensional photonic crystal with triangular lattices. We present a method for tuning a photonic crystal microcavity by rotating electromagnetically the director
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Liu, Fang-Yu, and 劉芳妤. "A Tunable Photonic Crystal Device with Multi-stable Photonic Band Gap." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/3d3487.

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碩士<br>國立中山大學<br>光電工程學系研究所<br>107<br>Photonic crystals are composed of periodic dielectric and has tiny volume. One of the important properties of photonic crystal is that electromagnetic wave cannot transmit in some specific frequency called photonic band gap(PBG). Photonic crystals can be applied in optic devices and systems such as beam splitter and photonic crystal fibers. However, most of the PBG in photonic crystal is not able to be tuned and therefore limit the applications. On the other hand, blue phase liquid crystal is a kind of self-assembly photonic crystal which has a high tenabili
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Wülbern, Jan Hendrik [Verfasser]. "Tunable photonic crystal devices / von Jan Hendrik Wülbern." 2010. http://d-nb.info/100592211X/34.

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Hsu, Chung-jen, and 許忠仁. "Design of Tunable Y-Shaped Photonic Crystal Waveguides." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/k333zk.

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碩士<br>國立中山大學<br>光電工程研究所<br>97<br>Photonic crystals (PCs) are structures with spatially periodic variations in dielectric constants. The prime property of PCs is the existence of the photonic band gaps (PBGs) which could prohibit the propagation of light within a certain frequency range. Once the PC structures are fabricated, it is hard to tune their optical properties for the fixed geometries. Thus, it is important to develop tunable PC waveguide devices for the applications in the photonic integrated circuits. We utilize the mode-gap effect to design two-dimensional (2-D) tunable Y-shaped P
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Liu, Chen-Yang, and 劉承揚. "Design and Analysis of Tunable Photonic Crystal Electro-optical Devices." Thesis, 2005. http://ndltd.ncl.edu.tw/handle/67748236059530834430.

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博士<br>國立成功大學<br>機械工程學系碩博士班<br>93<br>Photonic crystals are artificial dielectric or metallic structures in which the refractive index modulation gives rise to stop bands for optical waves within a certain frequency. The waveguide creates a band of conduction inside the bandgaps. These crystals have many potential applications because of their ability to control lightwave propagation. Such structures can be use to design highly efficient new optical devices. We investigated the properties of the photonic crystal waveguides and the tunable photonic crystal devices with liquid crystals numerically
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Wang, Liang-Jhih, and 王良誌. "1D Photonic Crystal Tunable Nanocavity Lasers with Novel Nanoclamp Structure." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/3wvq59.

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碩士<br>國立交通大學<br>光電工程研究所<br>107<br>In this thesis, based on the large wavelength response per percentage strain (7.8 nm) of 1D photonic crystal (PhC) tunable nanocavity laser, we further propose and setup novel nanoclamps nearby both sides of 1D PhCs. It can create a non-ideal elastic region to produce non-uniform structural deformation distribution under an applied linear stress. Owing to the different deformation between the clamped and unclamped regions, the wavelength response of the device can be significantly enhanced. At first, via the mechanical/optical numerical simulation based on fin
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Wu, Chia-Cheng, and 吳家政. "Optical Strain Sensors Based on 1D Photonic Crystal Tunable Nanolasers." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/zg8w2r.

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碩士<br>國立交通大學<br>光電工程研究所<br>106<br>In this thesis, we propose and study on 1D photonic crystal (PhC) tunable nanolasers buried in deformable material via compressing. Comparing with 2D PhC, 1D PhCs shows smaller device footprints and high compatibility with conventional optical ridge waveguide in photonic integrated circuits. We firstly simulate the optical properties of 1D PhC tunable nanocavity in PDMS under compression to decrease the lattice constants for demonstrating reproducible wavelength tuning. And then the 1D PhC tunable nanolasers in PDMS are realized by a series of nano-fabrication
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Yu, Sheng-pin, and 游勝濱. "Study on the characteristics of some tunable photonic crystal devices containing liquid crystal." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/77682791238472563014.

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碩士<br>國立中央大學<br>光電科學研究所<br>100<br>In this thesis we use the plane wave expansion method together with the finite element method (COMSOL Multiphysics 3.5a) to investigate the optical properties of some silicon based two-dimensional photonic crystals infiltrated with liquid crystals. We show that the photonic band gaps can be tuned by changing the orientation of the director of the liquid crystal (the direction of preferred orientation of liquid crystal molecules in the neighborhood of any point), which is controlled by the externally applied electric field. Large and useful photonic band gaps c
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Mahnkopf, Sven. "Photonic crystal based widely tunable laser diodes and integrated optoelectronic components." Doctoral thesis, 2005. https://nbn-resolving.org/urn:nbn:de:bvb:20-opus-13860.

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In a first aspect of this work, the development of photonic crystal based widely tunable laser diodes and their monolithic integration with photonic crystal based passive waveguide and coupler structures is explored theoretically and experimentally. In these devices, the photonic crystal is operated in the photonic bandgap which can be used for the realization of effective reflectors and waveguide structures. Such tunable light sources are of great interest for the development of optical network systems that are based on wavelength division multiplexing. In a second aspect of this work, the op
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Chia-ChinTsai and 蔡佳晉. "Design and Analysis of Tunable Photonic Crystal Devices Using Magneto-optical Defects." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/89261953202306304120.

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碩士<br>國立成功大學<br>機械工程學系<br>102<br>In this research a series of tunable photonic crystal (PhC) devices are proposed. The magneto-optical (MO) materials are infiltrated into the PhC structure to become point or line defects. With out-of-plane magnetization, the degenerate resonant modes splits into two counter-rotating modes at different frequencies. Furthermore, the quality factor of two splitting modes significantly increases to about 4000, which is suitable for applications of dense wavelength-division-multiplexing (DWDM) systems and refractive index sensors. When the out-of-plane magnetizatio
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王昭龍. "Design of tunable filter and dispersion compensator by one-dimensional photonic crystal." Thesis, 2006. http://ndltd.ncl.edu.tw/handle/55583227055848884727.

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Suh, Myoung-Gyun. "Theoretical Analysis on the Liquid Crystal Infiltrated Tunable 2D Photonic Crystal Laser using Finite-Difference Time-Domain Method." 2006. http://www.cetd.com.tw/ec/thesisdetail.aspx?etdun=U0001-2001200612060800.

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Suh, Myoung-Gyun, and 徐明均. "Theoretical Analysis on the Liquid Crystal Infiltrated Tunable 2D Photonic Crystal Laser using Finite-Difference Time-Domain Method." Thesis, 2006. http://ndltd.ncl.edu.tw/handle/33260491544218447513.

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碩士<br>國立臺灣大學<br>物理研究所<br>94<br>In recent years, with growing interests to Photonic Crystals (PhCs) and their applications, many researchers have studied PhCs. 2-Dimensional PhC laser is one of the interesting research topics due to its strong light confinement in a small wavelength-scale volume. Liquid Crystal (LC) infiltrated 2D PhC laser has also been investigated for the laser wavelength tuning, yet its theoretical study seems insufficient. Thus, in this research, we developed 3D Finite-Difference Time-Domain (FDTD) program which can simulate the light propagation in LCs, and analyzed the
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Mahnkopf, Sven [Verfasser]. "Photonic crystal based widely tunable laser diodes and integrated optoelectronic components / vorgelegt von Sven Mahnkopf." 2005. http://d-nb.info/979674492/34.

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40

Hsin-YuLin and 林星玗. "Thermally-controlled laser-mode conversion based on spatially tunable photonic bandgap cholesteric liquid crystal templates." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/24492245437224774317.

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碩士<br>國立成功大學<br>光電科學與工程學系<br>102<br>A spatially tunable dye-doped liquid crystal (DDLC) refilling cholesteric liquid crystal (CLC) polymer template device with a thermally controlled laser-mode conversion is successfully developed in this study. This laser device is fabricated through four stages: before curing, after curing, after washing out, and after refilling. Experimental results show that the tunable spectral range for the photonic bandgap (PBG) of the laser device covers nearly the entire white region (405 nm to 752 nm). The spatially tunable laser mode can be converted between random
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Jia-LunChang and 張家綸. "Broadband low-voltage tunable photonic bandgap and lasing devices based on ferroelectric liquid crystal and cholesteric liquid crystal composites." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/44k8e7.

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碩士<br>國立成功大學<br>光電科學與工程學系<br>106<br>This thesis mainly develops and studies the optical properties of ferroelectric liquid crystal and cholesteric liquid crystal (FLC-CLC) composite devices and further develops dye-doped FLC-CLC (DDFLC-CLC) lasers by means of electrothermal effect. Experimental results show that the device has photonic bandgap (PBG) control in the entire white light region in low-voltage range and at near room temperature, and the spectral range for tuning the lasing wavelength can be as wide as 100 nm. In first part, this study measures the temperature response of the electro
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Tsai, Chia-Chen, and 蔡佳珍. "ZnO Microspheres Made of High Synthesis Efficiency for Electrophoretically Self-Assembled Photonic Crystal Templates and Tunable Nanostructures." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/19911064683285607195.

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碩士<br>逢甲大學<br>材料科學所<br>98<br>The major objectives of this study are aimed at achieving (a) high synthetic efficiency fabrication of monodispersive submicron-sized zinc oxide (ZnO) spheres with high sphericity by sol-gel process, (b) synthesis of monodispersed ZnO microspheres with narrow size distribution by chemical bath deposition (CBD) method, (c) electrophoretic self-assembly (EPSA) formation and microstructural characterization of 3-D photonic crystal (PhC) templates of polystyrene (PS) microspheres at average size of 250 nm by emulsion polymerization. Our goal is to investigate the photo
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Jia-DeLin and 林嘉德. "Tunable Photonic Bandgap Device and Laser Based on Cholesteric and Blue Phase Liquid Crystal and Their Applications." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/93825852878819275868.

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博士<br>國立成功大學<br>光電科學與工程學系<br>103<br>Self-assembled photonic crystals (PhCs) based on liquid crystals (LCs) with chirality have high potential for the applications (e.g., soft matter-based integrated photonic circuit) because of their simple fabrication process as well as excellently controllable photonic properties. Cholesteric liquid crystal (CLC) and blue phase (BP) liquid crystal are two most representative materials with chiralities. With the addition of the chiral molecules, the LC molecules in CLC and BP can spontaneously self-organize as helical structures. The self-assembled helical st
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Guan-JoungWei and 韋冠中. "Wide-band spatially tunable and hyper-reflective photonic bandgap based on a refilled cholesteric liquid crystal polymer template." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/66647918187925597616.

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碩士<br>國立成功大學<br>光電科學與工程學系<br>102<br>The scientists in the field of liquid crystal (LC) exploited chiral LC polymer to fabricate novel cholesteric LC (CLC) polymer template (simply called template) in recent years. The template can effectively overcome the limitation in the optical features of traditional CLCs, such as enhancement of reflectivity over 50%, multiple photonic bandgaps (PBGs), and changeable optical characteristics by flexibly replacing the refillingLC materials, and so on. This thesis fabricates two gradient-pitched CLC templates with two opposite handednesses, which are then mer
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