Overview of photonic & phononic crystals and their similarities and differences

Publish Year: 1397
نوع سند: مقاله کنفرانسی
زبان: English
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CMTS02_174

تاریخ نمایه سازی: 29 تیر 1398

Abstract:

Photonic crystals are periodic optical structures that affect the motions of photons. Photonic crystals usually consist of periodic dielectrics as 1D, 2D, and 3D. The arrangement of a Photonic crystal is based on regularly repeating regions of high and low dielectric constants. Regarding the employed materials and type of their arrangements in a photonic crystal, the entered electromagnetic wave with different frequencies can be propagated through it or not. On the other hand, phononic crystals are a new field of research, whereas many scientists and researchers have been willing to assess these types of crystals. Phononic crystals build from two materials with different mechanical properties like young module and density. Amount of these parameters must be extremely distinct from each other due to the creation of larger acoustic band gap. Phononic crystals might be proposed by different phases such as solid-solid, solid-liquid, and liquid-liquid. In this study, it is simulated and studied propagation behaviors and their acoustic and optical properties in a 2D phononic crystal and corresponding photonic crystal, respectively. In following, it is briefly mentioned some their properties. Their similarities: the existence of bandgap can be one of the fundamental similarities for both photonic and the photonic crystals. The bandgap is created by the difference between two material’s characteristics, optical properties in the photonic crystals and the mechanical properties in the phononic crystals, as well. Both crystals can be built in the form of 1D, 2D, and 3D. There are several tapes of the periodicity of inclusions on the substrate, such as square, hexagonal and honeycomb that all of them have been evaluated for both phononic and photonic crystals. Their differences: first of all, elastic or acoustic propagation is evaluated in phononic crystal while electromagnetic wave can propagate along the photonic crystal. Moreover, operation frequencies are different, because photonic crystals usually work in the optical regime and their frequencies are usually around THz, while operation frequencies for phononic crystal are around GHz and it can also be reduced to KHz by selecting bigger dimension about centimeters.

Authors

Fakhroddin Nazari

Faculty of Engineering, Amol University of Special Modern Technologies, Amol, Iran