Abstract
We show theoretically that range of reflection bands and defect modes inside the band gap can be tuned by using a one-dimensional tilted photonic crystal (TPC) structure. A TPC structure is similar to the conventional PC structure with the only difference that in this case alternate layers are inclined at certain angle in the direction of periodicity of the structure. In order to obtain the reflectance spectra of the proposed structure transfer matrix method (TMM) has been employed. From the analysis of the reflectance curve, it is found that 100% reflectance range can be varied and enhanced by using TPC structure for both (TE- and TM-) polarizations. The enhancement in reflection bands increases as the tilt angle increases for both the polarizations and hence the enlarged omni-reflectance bands are obtained. Further, we study the properties of the defect modes in TPC structure by introducing the tilted defect at the different tilt angle. The results show that defect modes (tunneling modes) can be tuned at different wavelengths by changing the tilt angle of the structure without changing other parameters. Finally, the effect of variation thickness of defect layers on the tunneling mode has been studied for both TPC and conventional PC structure. The proposed model might be used as a tunable broadband omnidirectional reflector as well as tunable tunneling or transmission mode, which has potential applications in the field of photonics and optoelectronics.
Highlights
During the past two and half decades photonic crystal (PC) structures have been an interesting and emerging field of research due to their ability to control and manipulate light inside the periodic structure
Photonic crystal structure leads to many potent applications in the filed of photonics and optoelectronics [1-8]
One of the potential applications of one-dimensional PC structure is omnidirectional optical reflector which is widely used in recent years, and a great deal of work has been done by the previous researchers [9-14]
Summary
During the past two and half decades photonic crystal (PC) structures have been an interesting and emerging field of research due to their ability to control and manipulate light inside the periodic structure. The mirrors based on multilayer dielectric structure have high reflectivity over a certain range of wavelengths but it is very sensitive to the incident angles. Broad band Omnidirectional reflection (ODR) region with high reflectivity of PC structure mainly depends on the two aspects; one on the selection of materials with high refractive index contrast and other on the proposed model. We consider here the Si-based material in the structure because silicon (Si) gives the actual optical integration and it is a good material for the fabrication of photonic devices. It has a large refractive index with excellent mechanical and thermal properties and is compatible with Si-based microelectronics. The characteristics of Si in combination with the SiO2 material have been investigated extensively and an omnidirectional reflector produced by them has been reported
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