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金崇君, Chongjun Jin a), Zhi-Yuan Li, Martyn A. McLachlan, David W. McComb, Richard M. De La Rue and Nigel P. Johnson b)
JOURNAL OF APPLIED PHYSICS 99, 116109 (2006),-0001,():
-1年11月30日
A (001) oriented three-dimensionally periodic photonic crystal, free of cracks, has been fabricated via a modified template-assisted colloidal self-assembly method with polystyrene spheres. Analysis of the opal-type crystals has revealed the structure to be noncubic. This is a face-centered tetragonal (fct), (001) oriented photonic crystal. The optical properties of the crystals have been characterized at near-normal incidence by reflectance spectroscopy. It is found that the photonic stop band shifts to shorter wavelengths compared with an identical cubic structure oriented along the (001) direction. We have also simulated the stop band behavior of such fct crystals and their inverse silicon analogs, revealing that the polymer opal could provide an inverse template for the formation of photonic crystals with a complete band gap.
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金崇君, Chongjun Jin, Nigel P Johnson, Harold M H Chong, Aju S Jugessur, , Stephen Day, Dominic Gallagher and Richard M De La Rue
4 April 2005, Vol.13, No.7, OPTICS EXPRESS,-0001,():
-1年11月30日
A method for increasing the coupling efficiency between ridge optical waveguides and PhCCRWs is described. This increase is achieved via W1 channel waveguide sections, formed within a two-dimensional triangular lattice photonic crystal using mode-matching. The modematching is achieved by low quality-factor modified cavities added to both the input and output ports of the PhCCRW. A three dimensional finitedifference time-domain method has been used to simulate light propagation through the modified PhCCRW. We have fabricated PhCCRWs working at 1.5μm in silicon-on-insulator material. Measurements and simulations show that the overall transmission is improved by a factor of two.
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【期刊论文】Reflectionless Multichannel Wavelength Demultiplexer in a Transmission Resonator Configuration
金崇君, Chongjun Jin, Shanhui Fan, Shouzhen Han, and Daozhong Zhang
IEEE JOURNAL OF QUANTUM ELECTRONICS, VOL.39, NO.1, JANUARY 2003,-0001,():
-1年11月30日
A wave demultiplexer system with channels in a two-dimensional photonic crystal is proposed. The demultiplexer is realized by the coupling among an ultra-low-quality factor microcavity and resonators with high-quality factor. The coupling mode theory is employed to analyze the behavior of this system. The analytic results reveal that the reflection is fully absent at the peak frequencies for all channels. The simulations obtained by multiple-scattering method and experimental results in the microwave region show that the analysis is valid. This method might also be valuable for the design of other all-optical functional circuits.
Microcavity,, photonic crystal,, resonant couple,, wavelength-demultiplexer
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金崇君, Chongjun Jin, a) Shouzhen Han, Xiaodong Meng, Bingying Cheng, and Daozhong Zhang
JOURNAL OF APPLIED PHYSICS VOLUME 91, NUMBER 7 1 APRIL 2002,-0001,():
-1年11月30日
We propose a frequency selective demultiplexer that is realized by the directly resonant tunneling between waveguides and point defects in a two-dimensional photonic crystal. The multiple scattering method is used to simulate the behavior of the demultiplexer. Results show that the demultiplexing efficiency is very high when the point defects are symmetrically arranged at both sides of the central line of the inlet waveguide. The selective frequency is only determined by the defect mode of the corresponding point defect in the photonic crystal and is not affected by the other point defects. A microwave experiment results agree well with the simulation. This structure may be valuable for the design of all-optical integrated circuits.
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【期刊论文】Photonic gap in amorphous photonic materials
金崇君, Chongjun Jin, Xiaodong Meng, Bingying Cheng, Zhaolin Li, and Daozhong Zhang
PHYSICAL REVIEW B, VOLUME 63, 195107,-0001,():
-1年11月30日
Two-dimensional amorphous photonic materials are created, which do not possess any long-range order but have only short-range order. Our calculation of the multiple-scattering method shows that, for S-polarized waves, these materials have photonic gap that is independent of incident directions. Even though the detailed structures of amorphous photonic materials are different with each other, they possess a common photonic gap, if only they have the same short-range order. Based on our studies it may be confirmed that, for S-polarized waves, the first band gap of photonic crystals comes mainly from the short-range order, while the higher-order band gaps are related to the long-range order. The measured transmission spectrum of an amorphous photonic material agrees perfectly with the calculation.
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