Tunable plasmonic nanohole arrays actuated by responsive hydrogel cushion

Nityanand Sharma; Hamid Keshmiri; Xiaodong Zhou; T.I. Wong; Christian Petri; Ulrich Jonas; Bo Gunnar Liedberg; Jakub Dostalek

doi:10.1021/acs.jpcc.5b10336

Tunable plasmonic nanohole arrays actuated by responsive hydrogel cushion

Nityanand Sharma, Hamid Keshmiri, Xiaodong Zhou, T.I. Wong, Christian Petri, Ulrich Jonas, Bo Gunnar Liedberg, Jakub Dostalek

Research output: Contribution to journal › Article › peer-review

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

Original language	English
Pages (from-to)	561-568
Number of pages	8
Journal	Journal of Physical Chemistry C
Issue number	120
DOIs	https://doi.org/10.1021/acs.jpcc.5b10336
Publication status	Published - 2015

Research Field

Biosensor Technologies

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title = "Tunable plasmonic nanohole arrays actuated by responsive hydrogel cushion",

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",

author = "Nityanand Sharma and Hamid Keshmiri and Xiaodong Zhou and T.I. Wong and Christian Petri and Ulrich Jonas and Liedberg, {Bo Gunnar} and Jakub Dostalek",

year = "2015",

doi = "10.1021/acs.jpcc.5b10336",

language = "English",

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T1 - Tunable plasmonic nanohole arrays actuated by responsive hydrogel cushion

AU - Sharma, Nityanand

AU - Keshmiri, Hamid

AU - Zhou, Xiaodong

AU - Wong, T.I.

AU - Petri, Christian

AU - Jonas, Ulrich

AU - Liedberg, Bo Gunnar

AU - Dostalek, Jakub

PY - 2015

Y1 - 2015

N2 - 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

AB - 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

U2 - 10.1021/acs.jpcc.5b10336

DO - 10.1021/acs.jpcc.5b10336

M3 - Article

SN - 1932-7447

SP - 561

EP - 568

JO - Journal of Physical Chemistry C

JF - Journal of Physical Chemistry C

IS - 120

ER -

Tunable plasmonic nanohole arrays actuated by responsive hydrogel cushion

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