Backward-Emitting Silicon Nitride Optical Phased Array Enabling Efficient Wavelength-Tuned Beam Steering
Silicon nitride (SiN) optical phased arrays (OPAs) have emerged as a potential alternative to their silicon counterparts, due to their potential use in enhanced solid-state light detection and ranging. Grating antennas based on a SiN waveguide suffer from a limited beam steering efficiency, owing to...
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IEEE
2020-01-01
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| Series: | IEEE Photonics Journal |
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| Online Access: | https://ieeexplore.ieee.org/document/9177254/ |
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| author | Chul-Soon Im Bishal Bhandari Sung-Moon Kim Min-Cheol Oh Kyeong-Pyo Lee Taehoon Kim Sang-Shin Lee |
| author_facet | Chul-Soon Im Bishal Bhandari Sung-Moon Kim Min-Cheol Oh Kyeong-Pyo Lee Taehoon Kim Sang-Shin Lee |
| author_sort | Chul-Soon Im |
| collection | DOAJ |
| description | Silicon nitride (SiN) optical phased arrays (OPAs) have emerged as a potential alternative to their silicon counterparts, due to their potential use in enhanced solid-state light detection and ranging. Grating antennas based on a SiN waveguide suffer from a limited beam steering efficiency, owing to the relatively lower effective refractive index of the waveguide. To mitigate this limitation, we propose and demonstrate a backward-emitting SiN OPA incorporating a reinforced grating vector, which provides efficient wavelength-tuned beam steering along the longitudinal direction. Two backward-emitting OPAs were primarily characterized by their steering efficiency and the spectral emission for the main lobe, and they were compared with a forward-emitting device using a weakened grating vector. The results indicated that strengthening the grating vector for the antenna improved the beam steering efficiency but adversely affected the dependence of its directionality on the wavelength. The directionality was particularly inspected, with respect to major design parameters for the grating antennas, including the pitch and etch depth of a SiN grating, as well as the thickness of a buried oxide and SiN core layer. The proposed backward-emitting OPA scheme is expected to significantly promote its feasibility as an advanced beam scanning device. |
| format | Article |
| id | doaj-art-d15af2ff9de84eb8a8b618bd3dd5a95c |
| institution | Matheson Library |
| issn | 1943-0655 |
| language | English |
| publishDate | 2020-01-01 |
| publisher | IEEE |
| record_format | Article |
| series | IEEE Photonics Journal |
| spelling | doaj-art-d15af2ff9de84eb8a8b618bd3dd5a95c2025-07-01T23:56:41ZengIEEEIEEE Photonics Journal1943-06552020-01-0112511010.1109/JPHOT.2020.30190609177254Backward-Emitting Silicon Nitride Optical Phased Array Enabling Efficient Wavelength-Tuned Beam SteeringChul-Soon Im0https://orcid.org/0000-0001-9850-1919Bishal Bhandari1https://orcid.org/0000-0002-9532-6622Sung-Moon Kim2https://orcid.org/0000-0002-8080-8880Min-Cheol Oh3https://orcid.org/0000-0002-0849-2121Kyeong-Pyo Lee4Taehoon Kim5Sang-Shin Lee6https://orcid.org/0000-0001-5686-4893Department of Electronic Engineering, Kwangwoon University, Seoul, South KoreaDepartment of Electronic Engineering, Kwangwoon University, Seoul, South KoreaDepartment of Electronics Engineering, Pusan National University, Pusan, (Busan), South KoreaDepartment of Electronics Engineering, Pusan National University, Pusan, (Busan), South Koreai3system, Daejeon, South KoreaAgency for Defense Development, Daejeon, South KoreaDepartment of Electronic Engineering, Kwangwoon University, Seoul, South KoreaSilicon nitride (SiN) optical phased arrays (OPAs) have emerged as a potential alternative to their silicon counterparts, due to their potential use in enhanced solid-state light detection and ranging. Grating antennas based on a SiN waveguide suffer from a limited beam steering efficiency, owing to the relatively lower effective refractive index of the waveguide. To mitigate this limitation, we propose and demonstrate a backward-emitting SiN OPA incorporating a reinforced grating vector, which provides efficient wavelength-tuned beam steering along the longitudinal direction. Two backward-emitting OPAs were primarily characterized by their steering efficiency and the spectral emission for the main lobe, and they were compared with a forward-emitting device using a weakened grating vector. The results indicated that strengthening the grating vector for the antenna improved the beam steering efficiency but adversely affected the dependence of its directionality on the wavelength. The directionality was particularly inspected, with respect to major design parameters for the grating antennas, including the pitch and etch depth of a SiN grating, as well as the thickness of a buried oxide and SiN core layer. The proposed backward-emitting OPA scheme is expected to significantly promote its feasibility as an advanced beam scanning device.https://ieeexplore.ieee.org/document/9177254/Optical phased arraylight detection and rangingsilicon nitride photonics |
| spellingShingle | Chul-Soon Im Bishal Bhandari Sung-Moon Kim Min-Cheol Oh Kyeong-Pyo Lee Taehoon Kim Sang-Shin Lee Backward-Emitting Silicon Nitride Optical Phased Array Enabling Efficient Wavelength-Tuned Beam Steering IEEE Photonics Journal Optical phased array light detection and ranging silicon nitride photonics |
| title | Backward-Emitting Silicon Nitride Optical Phased Array Enabling Efficient Wavelength-Tuned Beam Steering |
| title_full | Backward-Emitting Silicon Nitride Optical Phased Array Enabling Efficient Wavelength-Tuned Beam Steering |
| title_fullStr | Backward-Emitting Silicon Nitride Optical Phased Array Enabling Efficient Wavelength-Tuned Beam Steering |
| title_full_unstemmed | Backward-Emitting Silicon Nitride Optical Phased Array Enabling Efficient Wavelength-Tuned Beam Steering |
| title_short | Backward-Emitting Silicon Nitride Optical Phased Array Enabling Efficient Wavelength-Tuned Beam Steering |
| title_sort | backward emitting silicon nitride optical phased array enabling efficient wavelength tuned beam steering |
| topic | Optical phased array light detection and ranging silicon nitride photonics |
| url | https://ieeexplore.ieee.org/document/9177254/ |
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