Reversibly tunable plasmonic bandgap by responsive hydrogel grating

Nityanand Sharma, Christian Petri, Ulrich Jonas, Jakub Dostalek

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)

Abstract

Reversible actuating of surface plasmon propagation by responsive hydrogel grating is reported. Thermo-responsive poly(N-isopropylacrylamide)-based (pNIPAAm) hydrogel nanostructure was designed and tethered to a gold surface in order to switch on and off Bragg scattering of surface plasmons which is associated with an occurrence of a bandgap in their dispersion relation. pNIPAAm-based grating with a period around 280 nm was prepared by using photo-crosslinkable terpolymer and laser interference lithography and it was brought in contact with water. The temperature induced swelling and collapse of pNIPAAm hydrogel grating strongly modulates its refractive index (Δn∼0.1) which leads to the reversible opening and closing of a plasmonic bandgap. The experiments demonstrate partial opening of a bandgap with the width of 12 nm at wavelength around 800 nm where SPR exhibited the spectral width of about 75 nm.

Original languageEnglish
Pages (from-to)2457-2465
Number of pages9
JournalOptics Express
Volume24
Issue number3
Early online date29 Jan 2016
DOIs
Publication statusPublished - 8 Feb 2016
Externally publishedYes

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