Study on transmission characteristics in photonic crystals with negative effective index of refraction

✍ Scribed by Tinggen Shen; Zhenghua Li; Junfeng Ma; Yong Sheng; Pengpeng Jiao; Bin Wu; Chenghua Xu

• Publisher: John Wiley and Sons
• Year: 2008
• Tongue: English
• Weight: 244 KB
• Volume: 43
• Category: Article
• ISSN: 0232-1300
• DOI: 10.1002/crat.200711063

✦ Synopsis

Abstract

Transmission spectra from equivalent negative refractive photonic crystals (PCs) composed of a triangular array of air cylinders in a GaAs matrix are studied by finite‐difference time‐domain method in the paper. Mechanism of wave resonance is probed and propagation of optical waves in the PCs is described in terms of effective refraction index and Bloch waves. Our numerical results show that probability of spontaneous radiation would be enhanced extremely under the influence of Bloch resonance waves, stimulated emission and photon tunnel effect, resulting in the optical waves localized greatly in the PCs at particular frequencies. In addition, we find out that the position of transmission peaks, with values far greater than unit, can be controlled by tuning the central frequency of waveguide source. It means that photon current in the PCs also can be controlled to optimize transmission properties of PCs, so as to meet the requirements of novel optical devices based on PCs. (© 2008 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)