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Multichannel tunable polarizing filter properties of one-dimensional ternary photonic crystal containing single-negative materials
Indian Journal of Physics ( IF 1.6 ) Pub Date : 2021-01-04 , DOI: 10.1007/s12648-020-01939-5
S. K. Awasthi

Angle and polarization-dependent tunable transmission properties of a one-dimensional (1D) ternary photonic crystal (TPC) whose period consists of three alternate layers of two different kinds of single-negative [Epsilon-negative (ENG) and mu-negative (MNG)] media are theoretically investigated by using the transfer matrix method (TMM). It has been shown that the proposed polarizing filter is capable of transmitting multiple polarized transmission peaks (called as channels) by adjusting the incident angle from 21° to 89° as per need. The resonant frequencies of these respective transmission channels are completely different for the case of TE and TM polarizations. The proposed structure contains only twelve SNG material layers corresponding to the period number N = 4. This structure filters 18 separate transmission channels for TE and TM waves each at incident angle \( \theta_{0} = 21^{\circ} \). The number of polarization dependent channels can be further increased to 35 and 37 for TE and TM polarizations, respectively, when the period number of 1D TPC increases from 4 to 8 at \( \theta_{0} = 89^{\circ} \). This eight-period 1D TPC structure requires only 24 SNG material layers. The effect of lossy SNG materials on the performance of the filter is also investigated. This study may find its application in the field of optical communication for accommodating a large number of optical channels in the same bandwidth. Such types of filters may have their applications in integrated optics for dense wavelength division multiplexing systems and ultrafast light information processing.



中文翻译:

含单负材料的一维三元光子晶体的多通道可调偏振滤光器特性

一维(1D)三元光子晶体(TPC)的角度和偏振相关的可调透射特性,其周期由两种不同的单负[Epsilon负(ENG)和mu负(MNG)的三个交替层组成)]使用传输矩阵方法(TMM)从理论上研究媒体。已经表明,所提出的偏振滤波器能够通过根据需要将入射角从21°调整到89°而能够透射多个偏振透射峰(称为通道)。在TE和TM极化的情况下,这些相应传输通道的谐振频率完全不同。提出的结构仅包含十二个SNG材料层,对应于周期号N = 4。该结构对TE波和TM波的18个分离的传输信道分别以入射角\(\ theta_ {0} = 21 ^ {\ circ} \)进行滤波。当1D TPC的周期数在\(\ theta_ {0} = 89 ^ {\ circ} \时,一维TPC的周期数从4增加到8时,与偏振有关的偏振通道数可以分别进一步增加到35和37 。 )。这种八周期一维TPC结构仅需要24个SNG材料层。还研究了有损SNG材料对过滤器性能的影响。这项研究可能会发现它在光通信领域中的应用,以容纳相同带宽中的大量光信道。这种类型的滤光片可能会在集成光学系统中用于密集波分复用系统和超快光信息处理。

更新日期:2021-01-04
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