Low divergence single-mode surface-emitting concentric-circular-grating terahertz quantum cascade lasers
We report the design, fabrication and experimental characterization of surface-emitting terahertz (THz) frequency quantum cascade lasers (QCLs) with distributed feedback concentric-circular-gratings. Single-mode operation is achieved at 3.73 THz with a side-mode suppression ratio as high as ~30 dB....
| Main Authors: | , , , , , , , , |
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| Format: | Journal Article |
| Language: | English |
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2014
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| Online Access: | https://hdl.handle.net/10356/101635 http://hdl.handle.net/10220/18734 |
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| author | Liang, Guozhen Liang, Houkun Zhang, Ying Li, Lianhe Davies, A. Giles Linfield, Edmund Yu, Siu Fung Liu, Hui Chun Wang, Qi Jie |
| author2 | School of Electrical and Electronic Engineering |
| author_facet | School of Electrical and Electronic Engineering Liang, Guozhen Liang, Houkun Zhang, Ying Li, Lianhe Davies, A. Giles Linfield, Edmund Yu, Siu Fung Liu, Hui Chun Wang, Qi Jie |
| author_sort | Liang, Guozhen |
| collection | NTU |
| description | We report the design, fabrication and experimental characterization of surface-emitting terahertz (THz) frequency quantum cascade lasers (QCLs) with distributed feedback concentric-circular-gratings. Single-mode operation is achieved at 3.73 THz with a side-mode suppression ratio as high as ~30 dB. The device emits ~5 times the power of a ridge laser of similar dimensions, with little degradation in the maximum operation temperature. Two lobes are observed in the far-field emission pattern, each of which has a divergence angle as narrow as ~13.5° × 7°. We demonstrate that deformation of the device boundary, caused by anisotropic wet chemical etching is the cause of this double-lobed profile, rather than the expected ring-shaped pattern. |
| first_indexed | 2025-02-19T03:35:18Z |
| format | Journal Article |
| id | ntu-10356/101635 |
| institution | Nanyang Technological University |
| language | English |
| last_indexed | 2025-02-19T03:35:18Z |
| publishDate | 2014 |
| record_format | dspace |
| spelling | ntu-10356/1016352020-03-07T14:00:33Z Low divergence single-mode surface-emitting concentric-circular-grating terahertz quantum cascade lasers Liang, Guozhen Liang, Houkun Zhang, Ying Li, Lianhe Davies, A. Giles Linfield, Edmund Yu, Siu Fung Liu, Hui Chun Wang, Qi Jie School of Electrical and Electronic Engineering School of Physical and Mathematical Sciences A*STAR SIMTech DRNTU::Science::Physics::Optics and light We report the design, fabrication and experimental characterization of surface-emitting terahertz (THz) frequency quantum cascade lasers (QCLs) with distributed feedback concentric-circular-gratings. Single-mode operation is achieved at 3.73 THz with a side-mode suppression ratio as high as ~30 dB. The device emits ~5 times the power of a ridge laser of similar dimensions, with little degradation in the maximum operation temperature. Two lobes are observed in the far-field emission pattern, each of which has a divergence angle as narrow as ~13.5° × 7°. We demonstrate that deformation of the device boundary, caused by anisotropic wet chemical etching is the cause of this double-lobed profile, rather than the expected ring-shaped pattern. ASTAR (Agency for Sci., Tech. and Research, S’pore) MOE (Min. of Education, S’pore) Published version 2014-01-29T02:03:34Z 2019-12-06T20:41:55Z 2014-01-29T02:03:34Z 2019-12-06T20:41:55Z 2013 2013 Journal Article Liang, G., Liang, H., Zhang, Y., Li, L., Davies, A. G., Linfield, E., et al. (2013). Low divergence single-mode surface-emitting concentric-circular-grating terahertz quantum cascade lasers. Optics express, 21(26), 31872-31882. 1094-4087 https://hdl.handle.net/10356/101635 http://hdl.handle.net/10220/18734 10.1364/OE.21.031872 en Optics express © 2013 Optical Society of America. This paper was published in Optics Express and is made available as an electronic reprint (preprint) with permission of Optical Society of America. The paper can be found at the following official DOI: [http://dx.doi.org/10.1364/OE.21.031872]. One print or electronic copy may be made for personal use only. Systematic or multiple reproduction, distribution to multiple locations via electronic or other means, duplication of any material in this paper for a fee or for commercial purposes, or modification of the content of the paper is prohibited and is subject to penalties under law. application/pdf |
| spellingShingle | DRNTU::Science::Physics::Optics and light Liang, Guozhen Liang, Houkun Zhang, Ying Li, Lianhe Davies, A. Giles Linfield, Edmund Yu, Siu Fung Liu, Hui Chun Wang, Qi Jie Low divergence single-mode surface-emitting concentric-circular-grating terahertz quantum cascade lasers |
| title | Low divergence single-mode surface-emitting concentric-circular-grating terahertz quantum cascade lasers |
| title_full | Low divergence single-mode surface-emitting concentric-circular-grating terahertz quantum cascade lasers |
| title_fullStr | Low divergence single-mode surface-emitting concentric-circular-grating terahertz quantum cascade lasers |
| title_full_unstemmed | Low divergence single-mode surface-emitting concentric-circular-grating terahertz quantum cascade lasers |
| title_short | Low divergence single-mode surface-emitting concentric-circular-grating terahertz quantum cascade lasers |
| title_sort | low divergence single mode surface emitting concentric circular grating terahertz quantum cascade lasers |
| topic | DRNTU::Science::Physics::Optics and light |
| url | https://hdl.handle.net/10356/101635 http://hdl.handle.net/10220/18734 |
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