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Hao L.,Harbin Institute of Technology | Hao L.,Northeast Petroleum University | Wang Q.,Harbin Institute of Technology | Wang Q.,Northeast Petroleum University | And 2 more authors.
Journal of Modern Optics | Year: 2014

Unlike previous cases discussed, non-linear changes of refractive index in the photorefractive (PR) materials are governed by both the linear and quadratic electro-optic (EO) effects simultaneously now. Here, the evolution equations of one-dimension spatial solitons resulting from both the linear and quadratic EO effect are presented firstly. Under appropriate conditions, our analysis indicates that bright, dark, and gray solitons can exist in the steady-state regime. Moreover, stabilities of bright and dark soliton propagation are analyzed by means of beam propagation methods. The analytical solutions in the low-amplitude regime are also obtained. The self-deflection of such bright spatial solitons arising from diffusion effect in biased PR crystals involving both the linear and quadratic EO effects has been investigated symmetrically by the use of numerical techniques and perturbation methods. © 2014 Taylor & Francis. Source


Zhao W.,Harbin Institute of Technology | Ju D.,Harbin Institute of Technology | Jiang Y.,Harbin Institute of Technology | Jiang Y.,Key Laboratory of Micro Optics and Photonic Technology of Heilongjiang Province | Zhan Q.,University of Dayton
Optics Express | Year: 2014

In this research paper, multiple trapped modes within a bi-periodic silicon particle array were studied numerically both through finite difference time domain method and finite element method. Anti-phased electric dipole, magnetic dipole, and magnetic quadrupole collective resonances in the two arrays result in three distinct trapped modes, which interact with the corresponding "bright modes" generating three sharp asymmetric Fano profiles in reflection. The lineshapes can be easily tailored by particle radius to achieve very narrow linewidth, while still remains 100% modulation depth. As a three-channel refractive sensor, the sensitivities for three working frequencies are 155nm/RIU, 725nm/RIU, and 190nm/RIU. © 2014 Optical Society of America. Source


Sun S.,Harbin Institute of Technology | Yi N.,Harbin Institute of Technology | Yao W.,Harbin Institute of Technology | Song Q.,Harbin Institute of Technology | And 2 more authors.
Optics Express | Year: 2014

We present a numerical simulation of second-harmonic generation (SHG) from a nonlinear magnetic metamaterial. By inserting a second-order nonlinear material in the high local field area of magnetic metamaterial, which consists of periodic arrays of paired thin silver strips, the convertion efficiency of SHG has been significantly enhanced by almost four orders of magnitude. The corresponding field patterns and further studies on dependance between SHG and symmetry of nonlinear crystal show that the increase of the conversion efficiency is attributed to the local field enhancement caused by the magnetic resonnance of the structure. Our researches provide an additional way to further improve the optical nonlinearity in nanostructures. © 2014 Optical Society of America Source


Ju D.,Harbin Institute of Technology | Pei H.,Harbin Institute of Technology | Jiang Y.,Harbin Institute of Technology | Jiang Y.,Key Laboratory of Micro Optics and Photonic Technology of Heilongjiang Province | Sun X.,Harbin Institute of Technology
Applied Physics Letters | Year: 2013

Nanojet effects excited by surface plasmon polariton at the shadow-side surfaces of dielectric microdisks positioned on gold films are reported. The surface plasmon nanojet can propagate over several optical wavelengths while still maintaining a subwavelength full-width at half-maximum transverse. Due to the nature of surface plasmon wave, the electric field of the highly confined nanojet at metal-dielectric interface is enhanced by about 30 times. By varying thickness of the dielectric microdisk, the formation of surface plasmon polariton nanojet can be flexibly controlled. The surface plasmon polariton nanojet shows great promise for enhanced Raman scattering and integrated plasmonic circuits. © 2013 AIP Publishing LLC. Source


Zhao W.,Harbin Institute of Technology | Ju D.,Harbin Institute of Technology | Jiang Y.,Harbin Institute of Technology | Jiang Y.,Key Laboratory of Micro Optics and Photonic Technology of Heilongjiang Province
Plasmonics | Year: 2015

In this research paper, a new type of Fano resonance originating from the far-field interference of lattice collective resonances of two sets of interlacing silver particle arrays with different radii is investigated numerically. The anti-phased collective resonance of the two arrays acts as “dark state”, while the phased one serves as “bright state”. The structure has the advantage to achieve both high modulation depth and sharp linewidth simultaneously, which is very attractive for plasmonic sensor, and the sensitivity and figure of merit can reach as high as 633 nm/RIU and 2000, respectively. Also, the structure has the merit of high Q factor up to 320. © 2014, Springer Science+Business Media New York. Source

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