Tunable ultra-narrow band-gap of anomalous dispersion photonic crystalsJiang-Tao Liu1, 2, Yun-Song Zhou1, Dong-Feng Chen3 and Qing-Mei Chen4
1 Department of Physics, Capital Normal University - Beijing 100037, PRC
2 SKLSM, Institute of Semiconductors, Chinese Academy of Sciences - P.O. Box 912, Beijing 100083, PRC
3 China Institute of Atomic Energy (CIAE) - Beijing 102413, PRC
4 Beijing University of Traditional Chinese Medicine - Beijing 100102, PRC
received 24 January 2007; accepted in final form 12 April 2007; published June 2007
published online 15 May 2007
We use the transfer-matrix method to research the band structures in one-dimensional photonic crystals composed of anomalous dispersion material (saturated atomic cesium vapor). Our calculations show that that type of photonic crystal possesses an ultra-narrow photonic band gap and this band gap is tunable when altering the electron population in the atomic ground state of the anomalous dispersion material by the optical pumping method.
42.70.Qs - Photonic bandgap materials .
78.67.-n - Optical properties of low-dimensional, mesoscopic, and nanoscale materials and structures .
32.10.Dk - Electric and magnetic moments, polarizability .
© Europhysics Letters Association 2007