Increased Refractive Index Sensitivity by Circular Dichroism Sensing through Reduced Substrate Effect

Publikation: Bidrag til tidsskrift/Konferencebidrag i tidsskrift /Bidrag til avisTidsskriftartikelForskningpeer review

Standard

Increased Refractive Index Sensitivity by Circular Dichroism Sensing through Reduced Substrate Effect. / Klös, Gunnar; Miola, Matteo; Sutherland, Duncan S.

I: Journal of Physical Chemistry C, Bind 123, Nr. 12, 03.2019, s. 7347-7355.

Publikation: Bidrag til tidsskrift/Konferencebidrag i tidsskrift /Bidrag til avisTidsskriftartikelForskningpeer review

Harvard

APA

CBE

MLA

Vancouver

Author

Klös, Gunnar ; Miola, Matteo ; Sutherland, Duncan S. / Increased Refractive Index Sensitivity by Circular Dichroism Sensing through Reduced Substrate Effect. I: Journal of Physical Chemistry C. 2019 ; Bind 123, Nr. 12. s. 7347-7355.

Bibtex

@article{2b85e48a6e9b46d4872ab5da712966c6,
title = "Increased Refractive Index Sensitivity by Circular Dichroism Sensing through Reduced Substrate Effect",
abstract = "An optical sensor based on the localized surface plasmon resonance (LSPR) of chiral Au nanohooks with increased refractive index (RI) sensitivity via circular dichroism (CD) measurements is presented. Programmed control of sample rotation combined with angled physical vapor deposition is applied to hole-mask colloidal lithography to provide in process modification of the hole-masks and generate arrays of chiral nanostructures with an adjustable optical response. Extinction spectra with unpolarized light as well as circular dichroism measurements are compared for left- and right-handed hook structures. Analysis of the LSPR peak shift of the substrate-attached nanostructures revealed the CD measurements to be twice as sensitive as the measurements with unpolarized light (304 and 146 nm RIU -1 , respectively) and close to the maximum predicted for LSPR sensing at this spectral region (∼700 nm). Finite-difference time-domain simulations with different substrate materials show that the difference in RI sensitivity can be attributed to the limiting effect of the substrate for the unpolarized extinction measurements, while CD-based sensing retains a high sensitivity, unaffected by the limiting effect of the substrate. CD-based readout could provide a complementary and improved sensitivity for substrate-bound LSPR sensor formats.",
keywords = "ARRAYS, ENHANCEMENT, METAMATERIALS, NANOPARTICLES, NANOSTRUCTURES, OPTICAL BIOSENSORS, SENSORS, SHAPE, SILVER, SURFACE-PLASMON RESONANCE",
author = "Gunnar Kl{\"o}s and Matteo Miola and Sutherland, {Duncan S.}",
year = "2019",
month = "3",
doi = "10.1021/acs.jpcc.8b12152",
language = "English",
volume = "123",
pages = "7347--7355",
journal = "The Journal of Physical Chemistry Part C",
issn = "1932-7447",
publisher = "American Chemical Society",
number = "12",

}

RIS

TY - JOUR

T1 - Increased Refractive Index Sensitivity by Circular Dichroism Sensing through Reduced Substrate Effect

AU - Klös, Gunnar

AU - Miola, Matteo

AU - Sutherland, Duncan S.

PY - 2019/3

Y1 - 2019/3

N2 - An optical sensor based on the localized surface plasmon resonance (LSPR) of chiral Au nanohooks with increased refractive index (RI) sensitivity via circular dichroism (CD) measurements is presented. Programmed control of sample rotation combined with angled physical vapor deposition is applied to hole-mask colloidal lithography to provide in process modification of the hole-masks and generate arrays of chiral nanostructures with an adjustable optical response. Extinction spectra with unpolarized light as well as circular dichroism measurements are compared for left- and right-handed hook structures. Analysis of the LSPR peak shift of the substrate-attached nanostructures revealed the CD measurements to be twice as sensitive as the measurements with unpolarized light (304 and 146 nm RIU -1 , respectively) and close to the maximum predicted for LSPR sensing at this spectral region (∼700 nm). Finite-difference time-domain simulations with different substrate materials show that the difference in RI sensitivity can be attributed to the limiting effect of the substrate for the unpolarized extinction measurements, while CD-based sensing retains a high sensitivity, unaffected by the limiting effect of the substrate. CD-based readout could provide a complementary and improved sensitivity for substrate-bound LSPR sensor formats.

AB - An optical sensor based on the localized surface plasmon resonance (LSPR) of chiral Au nanohooks with increased refractive index (RI) sensitivity via circular dichroism (CD) measurements is presented. Programmed control of sample rotation combined with angled physical vapor deposition is applied to hole-mask colloidal lithography to provide in process modification of the hole-masks and generate arrays of chiral nanostructures with an adjustable optical response. Extinction spectra with unpolarized light as well as circular dichroism measurements are compared for left- and right-handed hook structures. Analysis of the LSPR peak shift of the substrate-attached nanostructures revealed the CD measurements to be twice as sensitive as the measurements with unpolarized light (304 and 146 nm RIU -1 , respectively) and close to the maximum predicted for LSPR sensing at this spectral region (∼700 nm). Finite-difference time-domain simulations with different substrate materials show that the difference in RI sensitivity can be attributed to the limiting effect of the substrate for the unpolarized extinction measurements, while CD-based sensing retains a high sensitivity, unaffected by the limiting effect of the substrate. CD-based readout could provide a complementary and improved sensitivity for substrate-bound LSPR sensor formats.

KW - ARRAYS

KW - ENHANCEMENT

KW - METAMATERIALS

KW - NANOPARTICLES

KW - NANOSTRUCTURES

KW - OPTICAL BIOSENSORS

KW - SENSORS

KW - SHAPE

KW - SILVER

KW - SURFACE-PLASMON RESONANCE

UR - http://www.scopus.com/inward/record.url?scp=85063568932&partnerID=8YFLogxK

U2 - 10.1021/acs.jpcc.8b12152

DO - 10.1021/acs.jpcc.8b12152

M3 - Journal article

VL - 123

SP - 7347

EP - 7355

JO - The Journal of Physical Chemistry Part C

JF - The Journal of Physical Chemistry Part C

SN - 1932-7447

IS - 12

ER -