High-efficiency upward radiation in a slow-light grating beam scanner.
Opt Express
; 31(13): 22170-22178, 2023 Jun 19.
Article
em En
| MEDLINE
| ID: mdl-37381297
ABSTRACT
Slow-light grating (SLG) is used as a solid-state optical beam scanner, but the efficiency of conventional SLGs has been constrained by unwanted downward radiation. In this study, we developed a high-efficiency SLG consisting of through-hole grating and surface grating, which selectively radiates upward. Via the optimization using the covariance matrix adaptation evolution strategy, we designed a structure showing a maximum upward emissivity of 95% as well as moderate radiation rates and beam divergence. Experimentally, the emissivity was enhanced by 2-4â
dB and the roundtrip efficiency was improved by 5.4â
dB, which is significant in applications to light detection and ranging.
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Coleções:
01-internacional
Base de dados:
MEDLINE
Idioma:
En
Revista:
Opt Express
Assunto da revista:
OFTALMOLOGIA
Ano de publicação:
2023
Tipo de documento:
Article