<Emphasis Type="Bold">A Research of Magnetic Control Ferrite Photonic Crystal Filter</Emphasis>

In this article, an anisotropic magnetized ferrite photonic crystal model is analyzed by using the finite-difference time-domain method. The electromagnetic wave propagates in anisotropic ferrite material and forms two kinds of Eigen propagation mode: left-hand circular polarization (LCP) mode and right-hand circular polarization (RCP) mode. Therefore, the ferrite material is used to produce photonic crystal and wave polarized by these two kinds of polarization modes can be obtained. Because the electromagnetic properties of the ferrite material are greatly influenced by the bias magnetic field, the ferrite photonic crystal band gap can be controlled by adjusting the intensity of the bias magnetic field, and then a magnetron photonic crystal filter is formed. The results show that the magnetic photonic crystal with the bias magnetic field to the LCP/RCP wave forms different pass band and band gap, which can obtain different forms of polarized wave.     

Broadband Terahertz Absorption in Graphene-Embedded Photonic Crystals

The absorption in graphene is rather low at terahertz frequencies. Here, we present a graphene-embedded photonic crystal structure to realize broadband terahertz absorption in graphene. The approach provides absorption enhancement in the whole terahertz regime (from 0.1 to 10 THz). It is shown that the average absorption in the graphene-embedded photonic crystal can be enhanced in the multiple propagating bands of the photonic crystals. The absorption efficiency can be further improved by optimizing the characteristic frequency, optical thickness ratio in a unit cell, and the angle of incidence on the photonic crystals. A maximum broadband absorption factor of 28.8% was achieved for fixed alternative dielectric materials. The graphene-embedded photonic crystal is promising for terahertz functional devices with broadband response.     

Coupled external cavity photonic crystal enhanced fluorescence

We report a fundamentally new approach to enhance fluorescence in which surface adsorbed fluorophore‐tagged biomolecules are excited on a photonic crystal surface that functions as a narrow bandwidth and tunable mirror of an external cavity laser. This scheme leads to ～10× increase in the electromagnetic enhancement factor compared to ordinary photonic crystal enhanced fluorescence. In our experiments, the cavity automatically tunes its lasing wavelength to the resonance wavelength of the photonic crystal, ensuring optimal on‐resonance coupling even in the presence of variable device parameters and variations in the density of surface‐adsorbed capture molecules. We achieve ～10⁵× improvement in the limit of detection of a fluorophore‐tagged protein compared to its detection on an unpatterned glass substrate. The enhanced fluorescence signal and easy optical alignment make cavity‐coupled photonic crystals a viable approach for further reducing detection limits of optically‐excited light emitters that are used in biological assays. (© 2014 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)     

An Ultra-broadband Single Polarization Filter Based on Plasmonic Photonic Crystal Fiber with a Liquid Crystal Core

Plasmonics - An ultra-broadband single polarization filter based on plasmonic photonic crystal fiber with a liquid crystal core is investigated using the full-vectorial finite element method....     

Highly Sensitive Surface Plasmon Resonance Based D-Shaped Photonic Crystal Fiber Refractive Index Sensor

In this article, a D-shaped photonic crystal fiber based surface plasmon resonance sensor is proposed for refractive index sensing. Surface plasmon resonance effect between surface plasmon polariton modes and fiber core modes of the designed D-shaped photonic crystal fiber is used to measure the refractive index of the analyte. By using finite element method, the sensing properties of the proposed sensor are investigated, and a very high average sensitivity of 7700 nm/RIU with the resolution of 1.30 × 10^?5 RIU is obtained for the analyte of different refractive indices varies from 1.43 to 1.46. In the proposed sensor, the analyte and coating of gold are placed on the plane surface of the photonic crystal fiber, hence there is no necessity of the filling of voids, thus it is gentle to apply and easy to use.     

Role of Stopband and Localized Surface Plasmon Resonance in Raman Scattering from Metallo-Dielectric Photonic Crystals

Self-assembled photonic crystals grown from different colloidal sizes are coated with gold nanoparticles preferentially on their surface. The effect of localized surface plasmon resonance and the photonic stopband on the Raman scattering from these crystals is analyzed from the angle-dependent scattering measurements. The coupling of photonic and plasmonic modes at the surface of the photonic crystal is verified by measuring the increment in Raman scattering from the crystals containing the gold nanoparticles, and this increment is found to follow the spectral trend of localized surface plasmon resonance.     

Coupling Enhancement of Plasmonic Liquid Photonic Crystal Fiber

Plasmonics - In this paper, the coupling characteristics of a dual-core hybrid plasmonic liquid crystal photonic crystal fiber (PCF) is proposed and analyzed using full-vectorial finite-difference...     

Surface Plasmon Induced Polarization Filter Based on Au Wires and Liquid Crystal Infiltrated Photonic Crystal Fibers

The polarization filter characteristics of Au wires and liquid crystal infiltrated photonic crystal fibers are investigated by using the finite element method. The nematic liquid crystal of E7 being injected into cladding air holes is benefit to induce large birefringence under controllable electrical field. The simulation results show that the surface plasmon resonance is strongly inspired by core modes in y-polarized direction. Meanwhile, the coupling between core modes in x-polarized direction and surface plasmon polaritons modes is faint. The confinement losses can achieve 446 dB/cm in y-polarized direction and 0.8 dB/cm in x-polarized direction at wavelength of 1550 nm in one of our designed fiber. The effects of fiber structural parameters and temperature are investigated with a view of tuning and optimizing the confinement loss spectrum. Own to the large contrast of confinement losses in two orthogonal directions, the designed Au wires and liquid crystal infiltrated photonic crystal fibers promise candidate for tunable polarization filter devices.     

Controlling Optical Absorption of Graphene in Near-infrared Region by Surface Plasmons

Nowadays, graphene has many applications in optical instruments, biosensors, gas sensors, photovoltaic cells, and so on. In this study, we aimed at investigating the optical properties of graphene under the influence of plasmons created in one-dimensional photonic crystal structure by making use of the absorption spectrum. We put the gold photonic crystal in adjacent to graphene and placed an antireflection layer on top of it. Then, we studied the behavior of graphene absorption peaks in a near-infrared region. By analyzing the graphene behavior in this region, we observed that graphene absorption was increased up to 40% and graphene absorption value in absorption peak, absorption peak wavelength, absorption spectra width, and also its absorption spectra in a wide wavelength range from 1000 to 2500 nm, could be controlled by making use of different factors such as the substance of antireflection layer and photonic crystal geometric dimensions. This structure can make many applications possible for graphene such as using it to build biosensors to identify uric acid and some of the lipids that have specific significances in detecting atherosclerotic lesions as well as diagnosing the states of disease.     

Research on Transmission Characteristics of Two-Dimensional Superconducting Photonic Crystal in THz-Waves

Plasmonics - In this paper, the transmission characteristics of two-dimensional photonic crystal with Hg-1223 cylindrical array in transverse magnetic mode are studied in terahertz-waves by shift...     

High-Performance Temperature Sensor Based on One-dimensional Pyroelectric Photonic Crystals Comprising Tamm/Fano Resonances

Plasmonics - This research demonstrates a high-performance temperature sensor based on the one-dimensional photonic crystal. The main idea of our sensing procedure is essentially depending on the...     

Selective Absorption of Photonic Crystal with Graphene

Plasmonics - Selective absorption of photonic crystal with graphene is studied. The Photonic Crystal at THz regime with permittivity 4.2 is designed and validated with rigorous coupled-wave...     

Dark Plasmon-Solitons in Plasmonic Photonic Crystal Fiber Induced by Thermo-Modulational Nonlinearity of Metal

Plasmonics - In this paper, formation of dark plasmon-soliton in a plasmonic photonic crystal fiber (PPCF) structure is predicted and analyzed by the use of the generalized nonlinear...     

Extra-broad Photonic Crystal Fiber Refractive Index Sensor Based on Surface Plasmon Resonance

Plasmonics - We propose and investigate a photonic crystal fiber (PCF) refractive index sensor with triangular lattice and four large-size channels based on surface plasmon resonance. In such...     

Refractive Index Sensor Based on Surface Plasmon Resonance Excitation in a D-Shaped Photonic Crystal Fiber Coated by Titanium Nitride

Plasmonics - In this paper, a plasmonic refractive index sensor using a D-shaped photonic crystal fiber coated by titanium nitride has been proposed. The interaction and interplay between fiber...     

An Eye-Shaped Ultra-Sensitive Localized Surface Plasmon Resonance–Based Biochemical Sensor

Plasmonics - This research illustrates a parametric study based on surface plasmon resonance of a slightly gold-coated photonic crystal fiber (PCF). In verifying sensing accuracy, the proposed...     

One-Way Propagation and Complete Trapping of Terahertz Radiations in All-Dielectric Systems

Plasmonics - Surface magnetoplasmons (SMPs) in the three-layer structure of semiconductor, dielectric, and photonic crystal (PhC) are theoretically investigated. The PhC portion in the structure is...     

Design Analysis of Multisample Single-Analyte Surface Plasmon Resonance Biosensor Based on D-Shape Photonic Crystal Fibers

Plasmonics - This paper dealt with the analysis of a surface plasmon resonance (SPR)-based D-shape photonic crystal fiber (PCF) biosensor for the detection of multimolecules present in a single...     

A Photonic Crystal Fiber-Based Biosensor with Quasi-D-shaped Layout and ITO-Graphene Combination

Plasmonics - A quasi-D-shaped photonic crystal fiber (PCF) biosensor in the near-infrared region (NIR) is proposed for the purpose of detecting the analytes/liquids of different refractive indices...