Tunable Photonic Crystals

1999 ◽  
Vol 603 ◽  
Author(s):  
A. Figotin ◽  
Yu.A. Godin ◽  
I. Vitebsky
Keyword(s):  
Photonic Crystal ◽  
Photonic Crystals ◽  
Periodic Array ◽  
Refractive Indices ◽  
Spatially Periodic ◽  
Constitutive Components ◽  
Dielectric Structures

Photonic crystals are spatially periodic dielectric structures usually composed of two different components. We consider a photonic crystal formed by a periodic array of voids in an optically dense homogeneous substance as shown in Fig. 1. The electromagnetic (EM) spectrum of a photonic crystal with a given geometry is determined by the refractive indices of its constitutive components.

scholarly journals Novel nonreciprocal materials based on magnetic photonic crystals

2004 ◽  
Vol 834 ◽  
Author(s):  
A. Figotin ◽  
I. Vitebskiy
Keyword(s):  
Photonic Crystals ◽  
Faraday Rotation ◽  
Electromagnetic Waves ◽  
Bloch Wave ◽  
Electromagnetic Properties ◽  
Spatially Periodic ◽  
Spectral Asymmetry ◽  
Constitutive Components ◽  
Zero Group ◽  
Magnetic Photonic Crystals

ABSTRACTMagnetic photonic crystals are spatially periodic dielectric composites with at least one of the constitutive components being a magnetically polarized material. Magnetic polarization, either spontaneous or induced, is always associated with nonreciprocal circular birefringence (Faraday rotation), which can bring qualitatively new features to the electrodynamics of photonic crystals. If the geometry of the periodic array meets certain symmetry criterion, the electromagnetic properties of the composite appear similar to those of a hypothetical bianisotropic medium with gigantic linear magnetoelectric effect. In particular, such a photonic crystal can display sptrong spectral asymmetry, which implies that electromagnetic waves propagate from left to right significantly faster or slower than from right to left. The strong spectral asymmetry can result in the phenomenon of electromagnetic unidirectionality. A lossless unidirectional medium, being perfectly transmissive for electromagnetic wave of certain frequency, “freezes” the radiation of the same frequency propagating in the opposite direction. The frozen mode is a coherent Bloch wave with nearly zero group velocity and drastically enhanced amplitude. The phenomenon of electromagnetic unidirectionality is essentially nonreciprocal and unique to gyrotropic photonic crystals. Physical conditions for the phenomenon include (i) significant Faraday rotation in the magnetic component of the composite structure at the frequency range of interest and (ii) the proper spatial arangement of the constituents. Unidirectional photonic crystals can be very attractive for a variety of applications.

A bioinspired poly(N-isopropylacrylamide)/silver nanocomposite as a photonic crystal with both optical and thermal responses

Nanoscale ◽  
2017 ◽  
Vol 9 (35) ◽  
pp. 12969-12975 ◽  
Author(s):  
Xiang Fei ◽  
Tao Lu ◽  
Jun Ma ◽  
Shenmin Zhu ◽  
Di Zhang
Keyword(s):  
Photonic Crystal ◽  
Photonic Crystals ◽  
Butterfly Wing ◽  
Silver Nanocomposite

Photonic crystals with both optical and thermal responses based on a natural butterfly wing template.

Photonic crystals: A platform for label-free and enhanced fluorescence biomolecular and cellular assays

2008 ◽  
Vol 1133 ◽  
Author(s):  
Brian T. Cunningham ◽  
Leo Chan ◽  
Patrick C. Mathias ◽  
Nikhil Ganesh ◽  
Sherine George ◽  
...  
Keyword(s):  
Photonic Crystal ◽  
Photonic Crystals ◽  
High Throughput Screening ◽  
High Sensitivity ◽  
Excitation Wavelength ◽  
Label Free ◽  
Crystal Surfaces ◽  
Enhanced Fluorescence ◽  
Preferred Direction ◽  
Label Free Detection

Abstract Photonic crystal surfaces represent a class of resonant optical structures that are capable of supporting high intensity electromagnetic standing waves with near-field and far-field properties that can be exploited for high sensitivity detection of biomolecules and cells. While modulation of the resonant wavelength of a photonic crystal by the dielectric permittivity of adsorbed biomaterials enables label-free detection, the resonance can also be tuned to coincide with the excitation wavelength of common fluorescent tags - including organic molecules and semiconductor quantum dots. Photonic crystals are also capable of efficiently channeling fluorescent emission into a preferred direction for enhanced extraction efficiency. Photonic crystals can be designed to support multiple resonant modes that can perform label free detection, enhanced fluorescence excitation, and enhanced fluorescence extraction simultaneously on the same device. Because photonic crystal surfaces may be inexpensively produced over large surface areas by nanoreplica molding processes, they can be incorporated into disposable labware for applications such as pharmaceutical high throughput screening. In this talk, the optical properties of surface photonic crystals will be reviewed and several applications will be described, including results from screening a 200,000-member chemical compound library for inhibitors of protein-DNA interactions, gene expression microarrays, and high sensitivity of protein biomarkers.

scholarly journals Far-Field Focus and Dispersionless Anticrossing Bands in Two-Dimensional Photonic Crystals

2007 ◽  
Vol 2007 ◽  
pp. 1-8
Author(s):  
Xiaoshuang Chen ◽  
Renlong Zhou ◽  
Yong Zeng ◽  
Hongbo Chen ◽  
Wei Lu
Keyword(s):  
Photonic Crystal ◽  
Photonic Crystals ◽  
Negative Refraction ◽  
Far Field ◽  
Two Dimensional ◽  
Surface Polaritons ◽  
Concave Lens ◽  
Bloch Mode ◽  
Two Dimensional Photonic Crystal ◽  
Photonic Band

We review the simulation work for the far-field focus and dispersionless anticrossing bands in two-dimensional (2D) photonic crystals. In a two-dimensional photonic-crystal-based concave lens, the far-field focus of a plane wave is given by the distance between the focusing point and the lens. Strong and good-quality far-field focusing of a transmitted wave, explicitly following the well-known wave-beam negative refraction law, can be achieved. The spatial frequency information of the Bloch mode in multiple Brillouin zones (BZs) is investigated in order to indicate the wave propagation in two different regions. When considering the photonic transmission in a 2D photonic crystal composed of a negative phase-velocity medium (NPVM), it is shown that the dispersionless anticrossing bands are generated by the couplings among the localized surface polaritons of the NPVM rods. The photonic band structures of the NPVM photonic crystals are characterized by a topographical continuous dispersion relationship accompanied by many anticrossing bands.

scholarly journals Optical properties of GaAs 2D Archimedean photonic lattice tiling with the p4g symmetry

2008 ◽  
Vol 40 (2) ◽  
pp. 167-173 ◽  
Author(s):  
Dj. Jovanovic ◽  
R. Gajic ◽  
K. Hingerl
Keyword(s):  
Optical Properties ◽  
Photonic Crystal ◽  
Photonic Crystals ◽  
Negative Refraction ◽  
Group Symmetry ◽  
Electromagnetic Propagation ◽  
Space Group Symmetry ◽  
Space Group ◽  
Left Handedness ◽  
Archimedean Lattice

In this paper we present our investigation of 2D Archimedean lattice photonic crystals with p4g space group symmetry. The structures are made of GaAs both as air holes and dielectric rods in air. In order to analyze the photonic crystal optical properties we performed calculations of the band structures, equi-frequency contours and electromagnetic propagation through the basic structures and waveguides. In addition, we investigated negative refraction and left-handedness in the p4g photonic crystal.

scholarly journals Design of GaN-based photonic crystal surface emitting lasers with top TiO2 photonic crystals

2021 ◽  
pp. 105164
Author(s):  
Qifa Liu ◽  
Jingtong Bin ◽  
Kerui Feng ◽  
Lu Cheng ◽  
Lianjie Zhao ◽  
...  
Keyword(s):  
Photonic Crystal ◽  
Photonic Crystals ◽  
Crystal Surface ◽  
Surface Emitting Lasers ◽  
Emitting Lasers

scholarly journals Production of Intensifying Blue Light by Cherenkov Radiation Phenomena and Their Use as Power Source Applications

2021 ◽  
Author(s):  
Shima El-Shemy ◽  
Mostafa Eissa ◽  
Aly Arafa
Keyword(s):  
Photonic Crystal ◽  
Photonic Crystals ◽  
Aluminum Oxide ◽  
Titanium Oxide ◽  
Blue Light ◽  
Cherenkov Radiation ◽  
Power Source ◽  
One Dimension ◽  
Crystal Composite ◽  
High Reflectance

Abstract It is interesting to note in recent years for a large number of researchers the topic of photonic crystals (PhCs) because of their new and useful properties. In addition, there are many advantages to photonic crystals materials as a high reflectance materials as well as the high transmittance materials based on the target application. The calculations were done for Aluminum oxide and titanium oxide (Al2O3/TiO2) composite photonic crystal in one dimension, which shows a high reflectivity (~ 99 %). The chosen photonic crystal composite can be useful to reflect the Cherenkov light many times which comes out from Cherenkov radiation by using radioisotope 90Sr-90Y. The output intensified light has power 1.45 µwatt and 1.45 nwatt for 90Sr-90Y with the activity 1Ci and 1mCi respectively, that can be used for micro/nano-power source applications.

High Birefringent Terahertz Photonic Crystal Fiber Based on Material-Filled Structure

2013 ◽  
Vol 462-463 ◽  
pp. 599-603
Author(s):  
Jian Hua Li ◽  
Fei Huang ◽  
Yi Yang ◽  
Bao Fu Zhang ◽  
Hua Zhou
Keyword(s):  
Photonic Crystal ◽  
Structural Parameters ◽  
Refractive Indices ◽  
Plane Wave Expansion ◽  
Modal Birefringence ◽  
High Birefringence ◽  
Crystal Fiber ◽  
Crystal Fibers ◽  
Thz Applications ◽  
Large Frequency

A novel kind of high birefringent terahertz (THz) photonic crystal fibers (PCFs) with material-filled structure is proposed in this paper. Based on the material-filled technology, which different materials are selectively filled into four air holes of the inner first circle near the central core in the designed THz PCFs, high birefringence are obtained from the structural and material-filled induced asymmetry in large frequency ranges near 1THz. Modal birefringence with different structural parameters and diverse refractive indices of the filled materials are investigated by plane wave expansion (PWE) method. The numerical results show that high birefringence up to 10-3can be obtained and its structure is simpler than that of the early proposed highly birefringent THz PCFs. It is helpful for PCFs design and real fabrication in the potential THz applications.

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