Dr. Samad Roshan Entezar,
Volume 7, Issue 1 (6-2013)
Abstract
The performance of a polarizing beam splitter based
on the one-dimensional photonic crystals (1D-PCs), is theoretically investigated.
The polarizing beam splitter consists of a symmetric stack of the low-index quarter-wave
plates and the high-index half-wave plates with a central defect layer of air. The
linear transmission properties of the polarizing beam splitter are numerically
simulated by the transfer matrix method. The results show that the wavelength
of the polarizing beam splitter can be tuned by adjusting the thickness of the defect
layer of air and the incident angle of light due to the resonant couple of the evanescent
waves localized at the interfaces between neighboring layers.
Dr. Samad Roshan Entezar, Mrs Arezo Rashidi ,
Volume 8, Issue 2 (7-2014)
Abstract
In this paper, properties of reflection phase in one-dimensional quaternary photonic crystals combining dispersive meta-materials and positive index materials are investigated by transfer matrix method. Two omnidirectional band gaps are located in the band structure of considered structure. However, we limit our studies to the frequency range of the second wide band gap. We observe that the value of the reflection phase difference between TE and TM waves can be controlled by changing the incident angle and frequency. Also, the results show that the reflection phase difference in the second band gap increases by increasing the incident angle, and remains almost unchanged in a broad frequency band. Furthermore, at two points near to the edges of the gap the reflection phase difference keeps almost zero in spite of the change of incident angle. Based on these properties, phase compensators and omni-directionally synchronous reflectors and also polarizers can be designed.