Photonic Band Gap Materials: Light Control at Will




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Localization of light by optically manipulating magnetic nanoparticles



Qiao-Feng Dai, Sheng Lan, Hai-Dong Deng, and Li-Jun Wu

Laboratory of Photonic Information Technology, School for Information and Optoelectronic Science and Engineering,

South China Normal University, Guangzhou, Guangdong 510006, People’s Republic of China


Abstract


Localization of electronic waves in disordered solids has attracted great interest since the pioneering work of Anderson. Similar phenomenon can occur for electromagnetic waves in disordered media and Anderson localization of light has been investigated in both theory and experiment because of its importance in fundamental research and potential in device applications. One example that has successfully exploited this phenomenon for device application is the realization of random lasers. In principle, Anderson localization of light originates from multiple scattering of light in a system containing a large number of randomly distributed scatters. The criterion for the appearance of Anderson localization can be described as kl ~ 1, where k is the wave vector of light and l is the mean free path of photons in the disordered medium. So far, Anderson localization of light has been experimentally demonstrated in various scattering systems including polymer particles suspended in a liquid, semiconductors powders distributed in a polymer membrane, and optical lattices generated in an optical diffractive crystal etc. Among them, the use of the optical lattices created in an optical diffractive crystal provides a way to localize a light by another one. In this work, we experimentally demonstrate the localization of a light through an optical manipulation of magnetic particles by using another light. In addition, we show that the localization of light in this way can be employed to construct an “all-optical” switch with a large extinction ratio.


Key words: optical trapping, magnetic nanoparticles, photonic gap, optical switching


Localization Characteristics of Two-dimensional Metal Nanoparticle Structures



Jian-Wen Dong, Zi-Lan Deng, Xiao-Ning Pang, and He-Zhou Wang

State Key Laboratory of Optoelectronic Materials and Technologies, Zhongshan (Sun

Yat-Sen) University, Guangzhou 510275, China


Abstract


Recently, there has been great interest in the plasmon excitation of metal nanoparticles and their aggregates because of their novel properties and some plausible applications. We investigated the plasmonic modes in a two-dimensional (2D) quasicrystalline array of metal nanoparticles. The 2D quasi-periodic arrays of plasmonic particles are in fact more complex than those in the electronic and 2D photonic systems, as the eigenmodes can couple with free photons. With the help of the trajectory map method, we found that there are modes that are localized in some special ways and the plasmonic mode with highest spatial localization and highly fidelity is found to be a type of antiphase ring mode. In general, different localized modes have very different radial decay. There is no special relationship between the fidelity of the modes and their spatial localization. In this talk, I will tell you these rich and complex properties of the localized plasmonic modes.


Fabrication of three-dimensional photonic crystal based on rapid prototyping and gelcasting method and its performance study



Yawen HU, Dichen LI, Minjie WANG

(State key laboratory of Manufacturing Systems Engineering, Xi’an Jiaotong University, Xi’an, 710049)


Abstract

After simulation in Ansoft HFSS software of the three-dimensional diamond structure of photonic crystal with lattice constant of 12mm, a band gap ranged from 9.48GHz to 12.00GHz is obtained. With accordance to the simulation data, the rapid prototyping (RP) method is used to produce a resin mold of three-dimensional photonic crystal structure, the gelcasting method is used to inject alumina ceramic slurry into the resin mold. With some follow-up procedures, Al2O3-ceramic three-dimensional photonic crystal structure is obtained. The samples sintered and not sintered are tested and analyzed respectively.


Key words: photonic crystal, band gap, SL


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