Abstract-Study on a tunable narrow-band filter based on magnetic defects in photonic crystal in the terahertz region

Hui Zhang ; Xian-feng Xu ; Fei Fan ; Sheng-jiang Chang

http://opticalengineering.spiedigitallibrary.org/article.aspx?articleid=2280033

Hui Zhang, Xian-feng Xu

China University of Petroleum (East China), College of Science, Department of Physics and Optoelectronic Engineering, Changjiang West Road 66, Qingdao 266580, China

Fei Fan, Sheng-jiang Chang

Nankai University, Institute of Modern Optics, Weijin Road 94, Tianjin 300071, China

Opt. Eng. 54(4), 047104 (Apr 23, 2015). doi:10.1117/1.OE.54.4.047104

Abstract.  A narrow-band filter with a broad tuning range is designed based on a magnetic field controlled ferrite defect in photonic crystal for a terahertz (THz) wave. The resonance defect modes of a ferrite defect in photonic crystal in the THz region are studied by using the finite difference time domain method. Detailed calculations on the shifts of the defect mode frequency and transmission properties reveal that the peak frequency of transmission spectra can continuously vary from 0.77 to 0.95 THz under the external magnetic field and the bandwidth of the filter is about 0.015 THz.