Complete photonic bandgap in silicon nitride slab assisted by effective index difference between polarizations

doi:10.1007/s12200-022-00023-6

Front. Optoelectron.

2022, Vol. 15

Issue (2) : 20 https://doi.org/10.1007/s12200-022-00023-6

RESEARCH ARTICLE

Complete photonic bandgap in silicon nitride slab assisted by effective index difference between polarizations

Can Ma¹, Jin Hou¹(

), Chunyong Yang¹, Ming Shi¹, Shaoping Chen¹

¹. Hubei Key Laboratory of Intelligent Wireless
². Communications, Hubei Engineering Research Center
³. for Intelligent Internet of Things, College of Electronic
⁴. and Information Engineering, South-Central MinZu
⁵. University, Wuhan 430074, China

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Abstract

The slab effective index difference between the transverse-electric (TE) and transverse-magnetic (TM) polarizations was utilized to obtain complete photonic bandgap (CPBG) in a silicon nitride ( Si_xN_y) photonic crystal slab. For this, coincident frequency range in the TE photonic bandgap (PBG) and TM PBG, which denotes the CPBGs of the slab, must be found with the same structure. Through adjusting the effective index pair of TE and TM polarizations by changing the thickness of the Si_xN_y core layer, and also optimizing the structure parameters within the photonic crystal plane, a large normalized CPBG of 5.62% was theoretically obtained in a slab of Si_xN_y with a refractive index of 2.5. Moreover, based on the obtained CPBG, a microcavity which could support both TE and TM polarization was theoretically demonstrated. The cavity modes for different polarizations were both well confined, which proved the reliability of the CPBG. In addition, using the same method, the lowest refractive index of Si_xN_y on silica slab for a CPBG could be extended to as low as 2. The results indicate that there is potential for development of various high-performance CPBG devices based on Si_xN_y slab technology.

Keywords Silicon nitride slab Complete photonic bandgap (CPBG) Microcavity Slab device

Corresponding Author(s): Jin Hou

Issue Date: 16 May 2022

Cite this article:

Can Ma,Jin Hou,Chunyong Yang, et al. Complete photonic bandgap in silicon nitride slab assisted by effective index difference between polarizations[J]. Front. Optoelectron., 2022, 15(2): 20.

URL:

https://academic.hep.com.cn/foe/EN/10.1007/s12200-022-00023-6
https://academic.hep.com.cn/foe/EN/Y2022/V15/I2/20

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