Low loss, wideband, and high extinction ratio TM polarizer based on subwavelength gratings

Haoyu Wu; Yaohui Sun; Yue Zhou; Mengjia Lu; Guohua Hu; Binfeng Yun; Yiping Cui

doi:10.1364/AO.520940

Applied Optics
Vol. 63,
Issue 11,
pp. 2950-2956
(2024)
•https://doi.org/10.1364/AO.520940

Low loss, wideband, and high extinction ratio TM polarizer based on subwavelength gratings

Haoyu Wu, Yaohui Sun, Yue Zhou, Mengjia Lu, Guohua Hu, Binfeng Yun, and Yiping Cui

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Haoyu Wu, Yaohui Sun, Yue Zhou, Mengjia Lu, Guohua Hu, Binfeng Yun, and Yiping Cui, "Low loss, wideband, and high extinction ratio TM polarizer based on subwavelength gratings," Appl. Opt. 63, 2950-2956 (2024)

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Abstract

We propose a low loss, wideband silicon transverse magnetic (TM) polarizer with high polarization extinction ratio and low reflection based on subwavelength grating. By arranging and optimizing a mutually perpendicular subwavelength grating with different duty cycles as the core and cladding, efficient waveguiding and radiation can be achieved for the TM and transverse electric (TE) injection, respectively. In simulation, the proposed TM polarizer has a footprint of ${40}\;{\unicode{x00B5}{\rm m}} \times {16.68}\;{\unicode{x00B5}{\rm m}}$, an insertion loss ${\lt}{0.7}\;{\rm dB}$, a polarization extinction ratio $\ge {20}\;{\rm dB}$, and an unwanted TE reflection ${\lt} - {17.4}\;{\rm dB}$ in the wavelength range of 1230–1700 nm. Moreover, the fabrication tolerance of the proposed device is also investigated.

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Data underlying the results presented in this paper are not publicly available at this time but may be obtained from the authors upon reasonable request.

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Equations (4)

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$W_{1}$	$W_{2}$	$W_{3}$	$a_{1}$	$a_{2}$	$N_{1}$
450 nm	100 nm	8 µm	120 nm	80 nm	4
$g$	$Λ_{1}$	$Λ_{2}$	$L_{1}$	$L_{2}$
100 nm	200 nm	200 nm	7 µm	26 µm

Refs	Structure	Footprint ( $µ m^{2}$ )	BW (nm)	PER (dB)	IL (dB)	Refl (dB)
[19]	Interleaved SWG	$5.2 \times 0.5$	155	$> 20$	$< 0.32$	$> - 0.375$
[20]	Nanohole array	$7.21 \times 0.5$	245	$> 33$	$< 0.9$	/
[21]	Weakly coupled nanowires	$13.6 \times 1.3$	362	$> 21$	$< 1$	/
[22]	Taper SWG	$22 \times 1.3$	343	$> 20$	$< 0.4$	/
[23]	Linear chirped gratings	$18 \times 3$	415	$> 21$	$< 1.15$	$> - 0.3$
[28]	Contra-mode conversion Bragg gratings	$30 \times 0.8$	61	$> 30$	$< 0.13$	$< - 8.1$
[29]	Tilted SWG	$17.84 \times 1.1$	150	$> 20$	$< 0.4$	$< - 20$
[30]	Hybrid plasmonic	$10 \times 2.38$	65	$> 15$	$< 0.45$	$< - 14$
This work	Mutually perpendicular SWG	$40 \times 16.68$	470	$> 20$	$< 0.71$	$< - 17.4$

$W_{1}$	$W_{2}$	$W_{3}$	$a_{1}$	$a_{2}$	$N_{1}$
450 nm	100 nm	8 µm	120 nm	80 nm	4
$g$	$Λ_{1}$	$Λ_{2}$	$L_{1}$	$L_{2}$
100 nm	200 nm	200 nm	7 µm	26 µm

Refs	Structure	Footprint ( $µ m^{2}$ )	BW (nm)	PER (dB)	IL (dB)	Refl (dB)
[19]	Interleaved SWG	$5.2 \times 0.5$	155	$> 20$	$< 0.32$	$> - 0.375$
[20]	Nanohole array	$7.21 \times 0.5$	245	$> 33$	$< 0.9$	/
[21]	Weakly coupled nanowires	$13.6 \times 1.3$	362	$> 21$	$< 1$	/
[22]	Taper SWG	$22 \times 1.3$	343	$> 20$	$< 0.4$	/
[23]	Linear chirped gratings	$18 \times 3$	415	$> 21$	$< 1.15$	$> - 0.3$
[28]	Contra-mode conversion Bragg gratings	$30 \times 0.8$	61	$> 30$	$< 0.13$	$< - 8.1$
[29]	Tilted SWG	$17.84 \times 1.1$	150	$> 20$	$< 0.4$	$< - 20$
[30]	Hybrid plasmonic	$10 \times 2.38$	65	$> 15$	$< 0.45$	$< - 14$
This work	Mutually perpendicular SWG	$40 \times 16.68$	470	$> 20$	$< 0.71$	$< - 17.4$

Abstract

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Applied Optics