Ultracompact parabolic sidewall-profiled hybrid plasmonic waveguide Bragg grating with optimized spectral properties of long-wavelength passband

Tiantian Chi; Ji Xu; Le Yang; Jun Wang; Sheng Li; Han Yao; Huichao Cheng; Baifu Zhang; Yunqing Lu; Ning Liu; Ning Liu

doi:10.1364/AO.498442

Applied Optics
Vol. 62,
Issue 26,
pp. 6877-6882
(2023)
•https://doi.org/10.1364/AO.498442

Ultracompact parabolic sidewall-profiled hybrid plasmonic waveguide Bragg grating with optimized spectral properties of long-wavelength passband

Tiantian Chi, Ji Xu, Le Yang, Jun Wang, Sheng Li, Han Yao, Huichao Cheng, Baifu Zhang, Yunqing Lu, and Ning Liu

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Tiantian Chi, Ji Xu, Le Yang, Jun Wang, Sheng Li, Han Yao, Huichao Cheng, Baifu Zhang, Yunqing Lu, and Ning Liu, "Ultracompact parabolic sidewall-profiled hybrid plasmonic waveguide Bragg grating with optimized spectral properties of long-wavelength passband," Appl. Opt. 62, 6877-6882 (2023)

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Table of Contents Category
- Surface Optics and Plasmonics
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About this Article
History
- Original Manuscript: June 29, 2023
- Revised Manuscript: August 9, 2023
- Manuscript Accepted: August 12, 2023
- Published: September 5, 2023

Abstract

An ultracompact hybrid plasmonic waveguide Bragg grating (HPWBG) with improved spectral properties of long-wavelength passband is proposed. A hollow HPW is introduced to suppress the entire loss, and a parabolic profiled sidewall is designed to optimize the spectral properties for specific wave bands. The transfer matrix method and finite element method are combined to ensure the efficiency of numerical research. The results show that the parabolic profile effectively reduces the reflection and strengthens the resonance of the mode in the long-wavelength passband, suppressing the oscillations and realizing significant smoothness and improvement in transmission. The optimized transmittance is greater than 99%, and insertion loss is as low as 0.017 dB. A wide bandgap of 103 nm is also attained. The structure also has a compactness with a length of 3.4 µm and exhibits good tolerance. This work provides a scheme for designing and optimizing wavelength selecting devices and has potential application value in integrated photonic devices.

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Performance	Rectangle	Parabola
Bandgap ( $T < 5 %$ )^a	$\sim 1487 - 1626 n m$	$\sim 1498 - 1601 n m$
$T$ ^a ( $λ = 1550 n m$ )	$\sim 0.00415$	$\sim 0.0126$
$T_{L}$	$> 0.3$	$> 0.9$
Bandwidth ( $T_{L} > 99 %$ )^b	—	34 nm

Structure	ER (dB)	Bandgap (nm)	Length (µm)	Bandwidth ( $T_{L} > 99 %$ )^a
Rectangular profile HPWBG [17]	17.1	$\sim 160$	5	0
Sinusoidal profile WBG [18]	27	3	252.5	$\sim 40$
Apodized WBG [20]	25.7	1.4	800	NA^b
Phase-modulated WBG [26]	$\sim 25$	5	300	$\sim 10$
Parabolic profile HPWBG	19.4	103	3.4	34

Performance	Rectangle	Parabola
Bandgap ( $T < 5 %$ )^a	$\sim 1487 - 1626 n m$	$\sim 1498 - 1601 n m$
$T$ ^a ( $λ = 1550 n m$ )	$\sim 0.00415$	$\sim 0.0126$
$T_{L}$	$> 0.3$	$> 0.9$
Bandwidth ( $T_{L} > 99 %$ )^b	—	34 nm

Structure	ER (dB)	Bandgap (nm)	Length (µm)	Bandwidth ( $T_{L} > 99 %$ )^a
Rectangular profile HPWBG [17]	17.1	$\sim 160$	5	0
Sinusoidal profile WBG [18]	27	3	252.5	$\sim 40$
Apodized WBG [20]	25.7	1.4	800	NA^b
Phase-modulated WBG [26]	$\sim 25$	5	300	$\sim 10$
Parabolic profile HPWBG	19.4	103	3.4	34

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