Please use this identifier to cite or link to this item: http://hdl.handle.net/10497/22251
Title: 
Authors: 
Subjects: 
Brewster-angle effect
Thin film optics
Perfect absorbers
Visible frequencies
Graphene
Gas sensing
Issue Date: 
2019
Citation: 
Kandammathe Valiyaveedu Sreekanth, Mohamed ElKabbash, Medwal, R., Zhang, J., Letsou, T., Strangi, G., Hinczewski, M., Rawat, R. S., Guo, C., & Singh, R. (2019). Generalized brewster angle effect in thin-film optical absorbers and its application for graphene hydrogen sensing. ACS Photonics, 6(7), 1610-1617. https://doi.org/10.1021/acsphotonics.9b00564
Abstract: 
Generalized Brewster angle (GBA) is the incidence angle at polarization by reflection for p- or s-polarized light takes place. Realizing s-polarization Brewster effect requires a material with magnetic response which is challenging at optical frequencies since the magnetic response of materials at these frequencies is extremely weak. Here, we experimentally realize GBA effect in the visible using a thin-film absorber system consisting of a dielectric film on an absorbing substrate. Polarization by reflection is realized for both p- and s- polarized light at different angles of incidence and multiple wavelengths. We provide a theoretical framework for the generalized Brewster effect in thin-film light absorbers. We demonstrate hydrogen gas sensing using a single layer graphene film transferred on a thin-film absorber at the GBA with ~1 fg/mm2 aerial mass sensitivity. The ultrahigh sensitivity stems from the strong phase sensitivity near point-of-darkness, particularly at the GBA, and the strong light-matter interaction in planar nanocavities. These findings depart from the traditional domain of thin-films as mere interference optical coatings and highlight its many potential applications including gas sensing and biosensing.
Description: 
This is the final draft, after peer-review, of a manuscript published in ACS Photonics. The published version is available online at https://doi.org/10.1021/acsphotonics.9b00564
URI: 
ISSN: 
2330-4022 (print)
DOI: 
File Permission: 
Open
File Availability: 
With file
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