Abstract
Reversible actuating of surface plasmon propagation by
responsive hydrogel grating is reported. Thermo-responsive poly(Nisopropylacrylamide)-
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.
Originalsprache | Englisch |
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Seitenumfang | 1 |
Fachzeitschrift | Optics Express |
Volume | 24 |
Issue | 3 |
DOIs | |
Publikationsstatus | Veröffentlicht - 2016 |
Research Field
- Biosensor Technologies
Schlagwörter
- (240.6680) Surface plasmons; (250.5403) Plasmonics; (050.0050) Diffraction and