Electro-Optically Modulated Lossy-Mode Resonance-A New Approach for Label-Free Sensing

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F60076658%3A12310%2F24%3A43908397" target="_blank" >RIV/60076658:12310/24:43908397 - isvavai.cz</a>

Výsledek na webu

<a href="https://pubs.acs.org/doi/10.1021/acsphotonics.4c00215" target="_blank" >https://pubs.acs.org/doi/10.1021/acsphotonics.4c00215</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1021/acsphotonics.4c00215" target="_blank" >10.1021/acsphotonics.4c00215</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Electro-Optically Modulated Lossy-Mode Resonance-A New Approach for Label-Free Sensing

Popis výsledku v původním jazyce

In this work, we report studies on the impact of thin dielectric layer formation on the optical, electrochemical, and electro-optically modulated responses of an indium tin oxide (ITO)-coated optical fiber sensor. The properties of ITO, such as optical transparency, high refractive index, and electrochemical activity, make it possible to obtain a lossy-mode resonance (LMR) effect in the optical domain and simultaneously use the sensor as an electrode in the electrochemical domain. The dielectric layer has been obtained on the ITO surface with precision down to a single nanometer using the atomic layer deposition (ALD) method. It is considered a reference to forming a biological or chemical layer during label-free sensing applications of such dual-domain sensors. It has been found that the sensor responds in both optical and electrochemical domains to the formation of a coating on the ITO surface. Numerical and experimental studies have proven that there is also a strong impact of the dielectric layer on the electro-optical modulation effectiveness. Changes in ITO&apos;s refractive index and extinction coefficient at its interface with the layer are induced by the modulation of free charge carriers&apos; density. It has been shown that changes in the thickness of the dielectric layer, down to tenths of nanometers, can be precisely monitored when modulation is applied. Such an attribute is hardly possible when standard optical measurements, i.e., without modulation are considered. The findings open new opportunities for using electro-optical modulation in label-free sensing and biosensing, especially when small biological species or their low concentrations are targeted.

Název v anglickém jazyce

Electro-Optically Modulated Lossy-Mode Resonance-A New Approach for Label-Free Sensing

Popis výsledku anglicky

In this work, we report studies on the impact of thin dielectric layer formation on the optical, electrochemical, and electro-optically modulated responses of an indium tin oxide (ITO)-coated optical fiber sensor. The properties of ITO, such as optical transparency, high refractive index, and electrochemical activity, make it possible to obtain a lossy-mode resonance (LMR) effect in the optical domain and simultaneously use the sensor as an electrode in the electrochemical domain. The dielectric layer has been obtained on the ITO surface with precision down to a single nanometer using the atomic layer deposition (ALD) method. It is considered a reference to forming a biological or chemical layer during label-free sensing applications of such dual-domain sensors. It has been found that the sensor responds in both optical and electrochemical domains to the formation of a coating on the ITO surface. Numerical and experimental studies have proven that there is also a strong impact of the dielectric layer on the electro-optical modulation effectiveness. Changes in ITO&apos;s refractive index and extinction coefficient at its interface with the layer are induced by the modulation of free charge carriers&apos; density. It has been shown that changes in the thickness of the dielectric layer, down to tenths of nanometers, can be precisely monitored when modulation is applied. Such an attribute is hardly possible when standard optical measurements, i.e., without modulation are considered. The findings open new opportunities for using electro-optical modulation in label-free sensing and biosensing, especially when small biological species or their low concentrations are targeted.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

21001 - Nano-materials (production and properties)

Projekt

<a href="/cs/project/GF21-05030K" target="_blank" >GF21-05030K: Opticky polopropustné nanostruktury oxidu titanu na površích s komplexní geometrií pro zvýšení fotokonverze a citlivosti snímačů</a><br>

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2024

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

ACS Photonics

ISSN

2330-4022

e-ISSN

2330-4022

Svazek periodika

11

Číslo periodika v rámci svazku

5

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

9

Strana od-do

2061-2069

Kód UT WoS článku

001226227900001

EID výsledku v databázi Scopus

2-s2.0-85192233780