Tunable Fabry–Pérot filter based on one-dimensional photonic crystals with liquid crystal components

2009 ◽  
Vol 282 (6) ◽  
pp. 1220-1225 ◽  
Author(s):  
J. Cos ◽  
J. Ferre-Borrull ◽  
J. Pallares ◽  
L.F. Marsal
Keyword(s):  
Liquid Crystal ◽  
Photonic Crystals ◽  
One Dimensional ◽  
Fabry Perot

Tuned switching of surface waves by a liquid crystal cap layer in one-dimensional photonic crystals

2012 ◽  
Vol 51 (15) ◽  
pp. 2909 ◽  
Author(s):  
Hodjat Hajian ◽  
Behrooz Rezaei ◽  
Ali Soltani Vala ◽  
Manoochehr Kalafi
Keyword(s):  
Liquid Crystal ◽  
Photonic Crystals ◽  
Surface Waves ◽  
One Dimensional ◽  
Cap Layer

scholarly journals Double-cavity Fabry-Perot resonators based on one-dimensional silicon photonic crystals

2018 ◽  
Author(s):  
Vladimir Tolmachev ◽  
Anna Baldycheva ◽  
Tatiana S. Perova
Keyword(s):  
Photonic Crystals ◽  
One Dimensional ◽  
Silicon Photonic ◽  
Fabry Perot

Fabrication of Flexible One-Dimensional Porous Silicon Photonic Band-Gap Structures

2003 ◽  
Vol 797 ◽  
Author(s):  
Natalya Tokranova ◽  
Bai Xu ◽  
James Castracane
Keyword(s):  
Refractive Index ◽  
Porous Silicon ◽  
Photonic Crystals ◽  
Band Gap ◽  
Dielectric Material ◽  
Photonic Band Gap ◽  
Bragg Reflector ◽  
One Dimensional ◽  
Fabry Perot ◽  
Photonic Band

Photonic crystals are periodic dielectric structures that have a photonic band gap to control the propagation of light in a certain wavelength range. This property offers a means to manipulate photons in the same way as electrons can be controlled in an atomic lattice. Porous silicon is an ideal candidate fo r the fabrication of photonic crystals because of the availability of a variety of silicon micromachining techniques. One-dimensional photonic crystals with customized parameters can be economically fabricated using porous silicon multilayer structures with periodically modulated porosity. Despite the structural non-homogeneities, porous silicon fabricated on a p-type Si substrate has optical properties similar to a dielectric material with a single effective refractive index. The exact value of the refractive index for each layer depends on its porosity. An engineered porosity can be obtained by changing the etching currents during the anodization process. This results in a modulation of the refractive index. A stack of alternating layers with high and low porosity produces a distributed Bragg reflector (DBR). Various designs incorporating multilayer porous silicon structures with an optical Fabry-Perot resonator and coupled microcavities are under development and can serve as an optical filter. Prototypes of such free-standing structures with 21–200 stacked layers to be used as DBRs, Fabry-Perot resonators or coupled microcavities are being fabricated. These structures are coated with polystyrenesulfonate on their backsides to increase mechanical strength and at the same time maintain flexibility. In this work, reflectance spectra of these porous silicon multilayers with and without polymer on the backside were measured. Simulations of the multilayer one-dimensional photonic crystals were performed to predic t the reflectance spectrum and optimize their structures before the fabrication and to compare to experimental data.

scholarly journals Photochemical On–Off Switching of One-Dimensional Photonic Crystals Consisting of Azo-Functionalized Liquid Crystal Polymer and Polyvinyl Alcohol

Crystals ◽  
2019 ◽  
Vol 9 (12) ◽  
pp. 610 ◽  
Author(s):  
Sunnam Kim ◽  
Seiji Kurihara
Keyword(s):  
Phase Transition ◽  
Refractive Index ◽  
Liquid Crystal ◽  
Photonic Crystals ◽  
Polyvinyl Alcohol ◽  
Refractive Index Change ◽  
Liquid Crystal Polymer ◽  
Index Change ◽  
One Dimensional ◽  
Crystal Polymer

One-dimensional (1D) photonic crystals (PCs) are prepared from multi-bilayered films stacked with alternating azo-functionalized liquid crystal polymer (PAz) films and polyvinyl alcohol (PVA) films. Reflection with a wavelength that depends on the thickness of the films is observed, and the reflection can be turned on and off by switching between the two states, based on whether there is a difference in the refractive index between the two films. The refractive index change of PAz can be photochemically caused by a phase transition, based on the alignment states of the liquid crystal (LC). In this review, we focused on an effective photo-induced on–off switching approach in 1D PCs using LC properties and described the basic optical and chemical principles, the experimental results, and further optimizations.

Optically controllable photonic crystals and passively tunable terahertz metamaterials using dye-doped liquid crystal cells

2018 ◽  
Vol 6 (18) ◽  
pp. 4959-4966 ◽  
Author(s):  
Chia-Rong Lee ◽  
Shih-Hung Lin ◽  
Sheng-Min Wang ◽  
Jia-De Lin ◽  
Yu-Shao Chen ◽  
...  
Keyword(s):  
Liquid Crystal ◽  
Photonic Crystals ◽  
One Dimensional ◽  
Crystal Cells ◽  
Terahertz Metamaterials

This work fabricates a fishnet grating by exerting two one-dimensional (1D) holographic interference fields with mutually orthogonal grating vectors separately on the substrates of a dye-doped liquid crystal (DDLC) cell.

Optical study of 2D photonic crystals in an InP/GaInAsP slab waveguide structure

2001 ◽  
Vol 694 ◽  
Author(s):  
Rolando Ferrini ◽  
David Leuenberger ◽  
Mikaël Mulot ◽  
Min Qiu ◽  
Jürgen Moosburger ◽  
...  
Keyword(s):  
Optical Properties ◽  
Photonic Crystals ◽  
Fdtd Method ◽  
Slab Waveguide ◽  
Optical Study ◽  
One Dimensional ◽  
Fabry Perot ◽  
Out Of Plane ◽  
Waveguide Transmission ◽  
Difference Time

AbstractWe report on the optical properties of two dimensional (2D) photonic crystals (PCs) deeply etched in an InP/GaInAsP step-index waveguide. Transmission (T) measurements through simple PC slabs and through one-dimensional (1D) Fabry-Pérot (FP) cavities between PC mirrors are reported and compared to theory. A 2D finite difference time-domain (FDTD) method combined to a phenomenological out-of-plane loss model is used to assess different loss contributions. The PC optical properties are deduced from the FP peak analysis. The origin of the high T level observed inside the stopgap is investigated.

Optical study of 2D photonic crystals in an InP/GaInAsP slab waveguide structure

2001 ◽  
Vol 692 ◽  
Author(s):  
Rolando Ferrini ◽  
David Leuenberger ◽  
Mikaël Mulot ◽  
Min Qiu ◽  
Jürgen Moosburger ◽  
...  
Keyword(s):  
Optical Properties ◽  
Photonic Crystals ◽  
Fdtd Method ◽  
Slab Waveguide ◽  
Optical Study ◽  
One Dimensional ◽  
Fabry Perot ◽  
Out Of Plane ◽  
Waveguide Transmission ◽  
Difference Time

AbstractWe report on the optical properties of two dimensional (2D) photonic crystals (PCs) deeply etched in an InP/GaInAsP step-index waveguide. Transmission (T) measurements through simple PC slabs and through one-dimensional (1D) Fabry-Pérot (FP) cavities between PC mirrors are reported and compared to theory. A 2D finite difference time-domain (FDTD) method combined to a phenomenological out-of-plane loss model is used to assess different loss contributions. The PC optical properties are deduced from the FP peak analysis. The origin of the high T level observed inside the stopgap is investigated.

Controlling emission using one dimensional integrated photonic fluorescent collectors

MRS Advances ◽  
2015 ◽  
Vol 1 (59) ◽  
pp. 3909-3914
Author(s):  
Thomas S. Parel ◽  
Tomas Markvart
Keyword(s):  
Photonic Crystals ◽  
Band Gap ◽  
Total Internal Reflection ◽  
Photonic Band Gap ◽  
Edge Emission ◽  
Photon Transport ◽  
One Dimensional ◽  
Fabry Perot ◽  
Fluorescent Molecules ◽  
Photonic Band

ABSTRACTIt is known that photonic crystals can be used to suppress spontaneous emission. This property of photonic crystals has been investigated for suppressing and decreasing the propagation of photons within loss cones in fluorescent collectors. Fluorescent collectors can concentrate light onto solar cells by trapping fluorescence through total internal reflection. In an ideal fluorescent collector the major obstacle to efficient photon transport is the loss of photons through the top and bottom escape cones. One possible method to decrease this loss and improve the efficiency of these devices is to fabricate one-dimensional photonic crystals doped with fluorescent molecules. If these photonic crystals are tuned to exhibit a photonic band gap in the escape cone directions and at the emission frequencies of the fluorescent molecules, a suppression of the escape cone emission and an enhancement of the edge emission is expected. In this paper, we detail the fabrication of a one dimensional integrated photonic collector and show the suppression of the escape cone emission. This suppression of the escape cone will be shown to correspond to the photonic band gap and the modifications to the edge emission will be shown to correspond well with so called Fabry Perot modes. The control of emission inside fluorescent collectors opens up a number of additional possibilities for efficiency enhancements that will also be discussed.

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