Abstract
New plasmonic structure with actively tunable
optical characteristics based on thermoresponsive hydrogel is
reported. It consists of a thin, template-stripped Au film with
arrays of nanoholes that is tethered to a transparent support by a
cross-linked poly(N-isopropylacrylamide) (pNIPAAm)-based
polymer network. Upon a contact of the porous Au surface
with an aqueous environment, a rapid flow of water through the
pores enables swelling and collapsing of the underlying
pNIPAAm network. The swelling and collapsing could be
triggered by small temperature changes around the lower critical solution temperature (LCST) of the hydrogel. The process
is reversible, and it is associated with strong refractive index changes of Δn ∼ 0.1, which characteristically alters the spectrum of
surface plasmon modes supported by the porous Au film. This approach can offer new attractive means for optical biosensors
with flow-through architecture and actively tunable plasmonic transmission optical filters.
■ INTRODUCTION
Originalsprache | Englisch |
---|---|
Seiten (von - bis) | 561-568 |
Seitenumfang | 8 |
Fachzeitschrift | Journal of Physical Chemistry C |
Issue | 120 |
DOIs | |
Publikationsstatus | Veröffentlicht - 2015 |
Research Field
- Biosensor Technologies