NDLI: Search of Extremely Sensitive Near-Infrared Plasmonic Interfaces: A Theoretical Study

Content Provider	Springer Nature Link
Author	Saison Francioso, Ophélie Lévêque, Gaëtan Akjouj, Abdellatif Pennec, Yan Djafari Rouhani, Bahram Boukherroub, Rabah Szunerits, Sabine
Copyright Year	2013
Abstract	The sensitivity of the wavelength position of localized surface plasmon resonance (LSPR) in metal nanostructures to local changes in the refractive index has been widely used for label-free detection strategies. Tuning the optical properties of the nanostructures from the visible to the infrared region is expected to have a drastic effect on the refractive index sensitivity. Here, we theoretically investigate the optical response of a newly designed plasmonic interface to changes in the bulk refractive index by the finite difference time domain method. It consists of a structured interface, where the planar interface is superposed with dielectric pillars 30 nm in height and 125 nm in length with a separation distance of 15 nm. The pillars are covered with U-shaped gold nanostructures of 50 nm in height, 125 nm in length, and 5 nm of gold base thickness. The whole structure is finally covered with a 5-nm thick dielectric layer of n $_{2}$ = 2.63. This plasmonic structure shows bulk refractive index sensitivities up to 1750 nm/RIU (RIU : refractive index unit) in the near infrared (λ = 2621 nm). The enhanced sensitivity is a consequence of the extremely enhanced electrical field between the gold nanopillars of the plasmonic interface.
Starting Page	1691
Ending Page	1698
Page Count	8
File Format	PDF
ISSN	15571955
Journal	Plasmonics
Volume Number	8
Issue Number	4
e-ISSN	15571963
Language	English
Publisher	Springer US
Publisher Date	2013-08-10
Publisher Place	New York
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Localized surface plasmon resonance 2D grating structures Gold nanostructures Near infrared Dielectric layers Coating Lorentz–Drude model Biotechnology Nanotechnology Biophysics and Biological Physics Biochemistry
Content Type	Text
Resource Type	Article
Subject	Nanoscience and Nanotechnology Biochemistry Biophysics Biotechnology

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1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
5	Website/Portal (Helpdesk)	Queries regarding NDLI and its services	support@ndl.gov.in
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