Polarization characteristics of subwavelength aluminum wire grating in near infrared

doi:10.1007/s12200-009-0027-7

Front Optoelec Chin

2009, Vol. 2

Issue (2) : 187-191 https://doi.org/10.1007/s12200-009-0027-7

RESEARCH ARTICLE

Polarization characteristics of subwavelength aluminum wire grating in near infrared

Changkui HU^1,2(

), Deming LIU¹

1. College of Optoelectronic Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074, China; 2. School of Science, Wuhan University of Technology, Wuhan 430070, China

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Abstract

Rigorous coupled wave analysis (RCWA) was used to investigate the polarization characteristics of subwavelength aluminum wire grating in near infrared. Upon exposure to the atmosphere, a layer of Al₂O₃ forms rapidly on the aluminum wires, so the effect of metal oxide layers on the polarization properties is modeled and analyzed. It is shown that subwavelength aluminum wire grating with oxide layers forming on the wires still offers excellent polarization properties. As the thickness of the oxide layer increases, the transmission coefficient increases, but the extinction ratio decreases. In addition, a magnesium fluoride (MgF₂) layer was proposed to deposit between the aluminum wires and the substrate to enhance transmission coefficient. The theoretical research shows that subwavelength aluminum grid grating has high transmission coefficient and extinction ratio in near infrared, as well as uniform performance with wide variations in the angle of incidence. These features with their small size make it desirable for use in optical communication and allow more compact component designs.

Keywords integrated optics subwavelength gratings polarization-sensitive devices rigorous coupled wave analysis (RCWA)

Corresponding Author(s): HU Changkui,Email:hck@whut.edu.cn

Issue Date: 05 June 2009

Cite this article:

Changkui HU,Deming LIU. Polarization characteristics of subwavelength aluminum wire grating in near infrared[J]. Front Optoelec Chin, 2009, 2(2): 187-191.

URL:

https://academic.hep.com.cn/foe/EN/10.1007/s12200-009-0027-7
https://academic.hep.com.cn/foe/EN/Y2009/V2/I2/187

Fig.1 Schematic of subwavelength aluminum wire grating

Fig.2 Modeling of oxide layer

Fig.3 Effect of oxide on polarization properties of a subwavelength aluminum wire grating at normal incidence. (a) Extinction spectrum; (b) TM transmission spectrum

Fig.4 TM transmission and extinction ratio as a function of oxide layer thickness, normal incidence, and wavelength of incident light is 1550 nm

Fig.5 TM transmission and extinction ratio as a function of incident angle (Λ=140 nm, =140 nm, =5 nm, =75 nm, normal incidence, and wavelength of incident light is 1550 nm)

Fig.6 Schematic of subwavelength aluminum wire grating with an additional magnesium fluoride layer

Fig.7 Effect of MgF layer on polarization properties of a subwavelength aluminum wire grating (Λ=140 nm, =140 nm, =5 nm, =75 nm, and normal incidence). (a) Extinction spectrum; (b) TM transmission spectrum

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