Change search
ReferencesLink to record
Permanent link

Direct link
Narrow band perfect absorber for maximum localized magnetic and electric field enhancement and sensing applications
KTH, School of Electrical Engineering (EES), Electromagnetic Engineering. Zhejiang University, China.
2016 (English)In: Scientific Reports, ISSN 2045-2322, E-ISSN 2045-2322, Vol. 6, 24063Article in journal (Refereed) PublishedText
Abstract [en]

Plasmonics offer an exciting way to mediate the interaction between light and matter, allowing strong field enhancement and confinement, large absorption and scattering at resonance. However, simultaneous realization of ultra-narrow band perfect absorption and electromagnetic field enhancement is challenging due to the intrinsic high optical losses and radiative damping in metals. Here, we propose an all-metal plasmonic absorber with an absorption bandwidth less than 8 nm and polarization insensitive absorptivity exceeding 99%. Unlike traditional Metal-Dielectric-Metal configurations, we demonstrate that the narrowband perfect absorption and field enhancement are ascribed to the vertical gap plasmonic mode in the deep subwavelength scale, which has a high quality factor of 120 and mode volume of about 10(-4) x (lambda(res)/n)(3). Based on the coupled mode theory, we verify that the diluted field enhancement is proportional to the absorption, and thus perfect absorption is critical to maximum field enhancement. In addition, the proposed perfect absorber can be operated as a refractive index sensor with a sensitivity of 885 nm/RIU and figure of merit as high as 110. It provides a new design strategy for narrow band perfect absorption and local field enhancement, and has potential applications in biosensors, filters and nonlinear optics.

Place, publisher, year, edition, pages
2016. Vol. 6, 24063
National Category
Other Physics Topics
Identifiers
URN: urn:nbn:se:kth:diva-185606DOI: 10.1038/srep24063ISI: 000373339500001PubMedID: 27046540ScopusID: 2-s2.0-84962635778OAI: oai:DiVA.org:kth-185606DiVA: diva2:924217
Funder
Swedish Research Council, 621-2011-4620
Note

QC 20160428

Available from: 2016-04-28 Created: 2016-04-25 Last updated: 2016-04-28Bibliographically approved

Open Access in DiVA

No full text

Other links

Publisher's full textPubMedScopus

Search in DiVA

By author/editor
He, Sailing
By organisation
Electromagnetic Engineering
In the same journal
Scientific Reports
Other Physics Topics

Search outside of DiVA

GoogleGoogle Scholar
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

Altmetric score

Total: 16 hits
ReferencesLink to record
Permanent link

Direct link