Total absorption of visible light in ultrathin weakly absorbing semiconductor gratings

Sturmberg, BCP; Chong, TK; Choi, DY; White, TP; Botten, LC; Dossou, KB; Poulton, CG; Catchpole, KR; McPhedran, RC; de Sterke, CM

Total absorption of visible light in ultrathin weakly absorbing semiconductor gratings

Sturmberg, BCP Chong, TK Choi, DY White, TP Botten, LC

Dossou, KB

Poulton, CG

Catchpole, KR McPhedran, RC de Sterke, CM

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Publication Type:: Journal Article
Citation:: Optica, 2016, 3 (6), pp. 556 - 562
Issue Date:: 2016-06-20

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Field	Value	Language
dc.contributor.author	Sturmberg, BCP	en_US
dc.contributor.author	Chong, TK	en_US
dc.contributor.author	Choi, DY	en_US
dc.contributor.author	White, TP	en_US
dc.contributor.author	Botten, LC https://orcid.org/0000-0001-6471-6954	en_US
dc.contributor.author	Dossou, KB https://orcid.org/0000-0002-2342-8945	en_US
dc.contributor.author	Poulton, CG https://orcid.org/0000-0002-2707-3424	en_US
dc.contributor.author	Catchpole, KR	en_US
dc.contributor.author	McPhedran, RC	en_US
dc.contributor.author	de Sterke, CM	en_US
dc.date.issued	2016-06-20	en_US
dc.identifier.citation	Optica, 2016, 3 (6), pp. 556 - 562	en_US
dc.identifier.issn	2334-2536	en_US
dc.identifier.uri	http://hdl.handle.net/10453/47673
dc.description.abstract	© 2016 Optical Society of America. The perfect absorption of light in subwavelength thickness layers generally relies on exotic materials, metamaterials or thick metallic gratings. Here we demonstrate that total light absorption can be achieved in ultra-thin gratings composed of conventional materials, including relatively weakly-absorbing semiconductors, which are compatible with optoelectronic applications such as photodetectors and optical modulators. We fabricate a 41 nm thick antimony sulphide grating structure that has a measured absorptance of A = 99.3% at a visible wavelength of 591 nm, in excellent agreement with theory. We infer that the absorption within the grating is A = 98.7%, with only A = 0.6% within the silver mirror. A planar reference sample absorbs A = 7.7% at this wavelength.	en_US
dc.relation	http://purl.org/au-research/grants/arc/CE110001018
dc.relation.ispartof	Optica	en_US
dc.relation.isbasedon	10.1364/OPTICA.3.000556	en_US
dc.rights	© 2016 Optical Society of America. Users may use, reuse, and build upon the article, or use the article for text or data mining, so long as such uses are for non-commercial purposes and appropriate attribution is maintained. All other rights are reserved.	en_US
dc.title	Total absorption of visible light in ultrathin weakly absorbing semiconductor gratings	en_US
dc.type	Journal Article
utslib.citation.volume	6	en_US
utslib.citation.volume	3	en_US
utslib.for	0205 Optical Physics	en_US
utslib.for	0105 Mathematical Physics	en_US
utslib.for	0906 Electrical and Electronic Engineering	en_US
utslib.for	1005 Communications Technologies	en_US
pubs.embargo.period	Not known	en_US
pubs.organisational-group	/University of Technology Sydney
pubs.organisational-group	/University of Technology Sydney/DVC (Resources)
pubs.organisational-group	/University of Technology Sydney/Faculty of Science
pubs.organisational-group	/University of Technology Sydney/Faculty of Science/School of Mathematical and Physical Sciences
utslib.copyright.status	open_access
pubs.issue	6	en_US
pubs.publication-status	Published	en_US
pubs.volume	3	en_US

Abstract:

© 2016 Optical Society of America. The perfect absorption of light in subwavelength thickness layers generally relies on exotic materials, metamaterials or thick metallic gratings. Here we demonstrate that total light absorption can be achieved in ultra-thin gratings composed of conventional materials, including relatively weakly-absorbing semiconductors, which are compatible with optoelectronic applications such as photodetectors and optical modulators. We fabricate a 41 nm thick antimony sulphide grating structure that has a measured absorptance of A = 99.3% at a visible wavelength of 591 nm, in excellent agreement with theory. We infer that the absorption within the grating is A = 98.7%, with only A = 0.6% within the silver mirror. A planar reference sample absorbs A = 7.7% at this wavelength.

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http://hdl.handle.net/10453/47673