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【期刊论文】Two-dimensional metallodielectric photonic crystal with a large band gap
金崇君, Chongjun Jin, a) Bingying Cheng, Baoyuan Man, and Daozhong Zhang, Shouzheng Ban and Bo Sun, Lieming Li, Xiangdong Zhang and Zhaoqing Zhang
APPLIED PHYSICS LETTERS VOLUME 75, NUMBER 9 30 AUGUST 1999,-0001,():
-1年11月30日
Three kinds of square metallodielectric photonic crystals have been fabricated. In these crystals, a very small metal cylinder is inserted into the center of each unit cell, while the dielectric cylinders are located at the corners of each unit cell. The transmissions of these photonic crystals have been measured in the microwave region. Compared with dielectric photonic crystals, the first photonic band gap is enlarged by a factor of 2. The experimental results agree well with the simulation obtained by the multiscattering approach. This method may be valuable for the design of photonic crystals with a large band gap.
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金崇君, Chongjun Jin, Bingying Cheng, Baoyuan Man, Zhaolin Li, and Daozhong Zhang
PHYSICAL REVIEW B VOLUME 61, NUMBER 16 15 APRIL 2000-11,-0001,():
-1年11月30日
We experimentally and numerically demonstrate dodecagonal and decagonal quasiperiodic photonic crystals in the microwave region. The results show that only a small number of rows are needed to create a frequency gap in the transmission spectrum, and that the gap position is insensitive to the incident angle. In particular, there is no defect state at the first gap of a dodecagonal quasiperiodic photonic crystal when there is a cavity in the center region, even though the cavity volume is much larger than the square of the wavelength. The decagonal quasiperiodic crystal can offer great possibilities for creating defect states. These quasiperiodic photonic crystals may find some important applications in photoelectric devices.
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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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【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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