A High-Performance Gas Sensor Employing a Spacer-Based Cavity With Distributed Bragg Reflectors

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68081731%3A_____%2F25%3A00619014" target="_blank" >RIV/68081731:_____/25:00619014 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/61989100:27240/25:10257237

Výsledek na webu

<a href="https://ieeexplore.ieee.org/document/10908460" target="_blank" >https://ieeexplore.ieee.org/document/10908460</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1109/JSEN.2025.3543877" target="_blank" >10.1109/JSEN.2025.3543877</a>

Jazyk výsledku

angličtina

Název v původním jazyce

A High-Performance Gas Sensor Employing a Spacer-Based Cavity With Distributed Bragg Reflectors

Popis výsledku v původním jazyce

A spacer-based cavity with distributed Bragg reflectors (DBRs) is employed in high-performance gas sensing utilizing wavelength interrogation. The DBR is formed by a 1-D photonic crystal (1DPhC) comprising six bilayers of TiO2/SiO2 with a termination layer of TiO2, and the spacer is a Ti layer deposited partially on one of the DBRs. The reflectance spectra of the sensor are measured in visible and near-infrared spectral regions at a near-normal incidence of light for humid air, and narrow dips in the 1DPhC bandgap due to the cavity modes are resolved. Two thicknesses of the spacer are considered, and it is revealed that the spacer thickness change is accompanied by nearly fivefold sensitivity enhancement. The sensitivity to relative humidity (RH) of humid air, a figure of merit (FOM), and the limit of detection reached 0.444 nm/%RH, 0.178%RH-1, and 0.022%RH, respectively. The theoretical analysis showed that the RH response of the sensor is due to the porous termination layer of the 1DPhC, and the strong dependence of the sensor sensitivity and FOM on both the spacer thickness and the position of the resonance dip in the bandgap was confirmed. A sensor employing a spacer-based cavity with DBRs thus represents an effective alternative with advantages such as sensing at normal incidence of light with high sensitivity and FOM.

Název v anglickém jazyce

A High-Performance Gas Sensor Employing a Spacer-Based Cavity With Distributed Bragg Reflectors

Popis výsledku anglicky

A spacer-based cavity with distributed Bragg reflectors (DBRs) is employed in high-performance gas sensing utilizing wavelength interrogation. The DBR is formed by a 1-D photonic crystal (1DPhC) comprising six bilayers of TiO2/SiO2 with a termination layer of TiO2, and the spacer is a Ti layer deposited partially on one of the DBRs. The reflectance spectra of the sensor are measured in visible and near-infrared spectral regions at a near-normal incidence of light for humid air, and narrow dips in the 1DPhC bandgap due to the cavity modes are resolved. Two thicknesses of the spacer are considered, and it is revealed that the spacer thickness change is accompanied by nearly fivefold sensitivity enhancement. The sensitivity to relative humidity (RH) of humid air, a figure of merit (FOM), and the limit of detection reached 0.444 nm/%RH, 0.178%RH-1, and 0.022%RH, respectively. The theoretical analysis showed that the RH response of the sensor is due to the porous termination layer of the 1DPhC, and the strong dependence of the sensor sensitivity and FOM on both the spacer thickness and the position of the resonance dip in the bandgap was confirmed. A sensor employing a spacer-based cavity with DBRs thus represents an effective alternative with advantages such as sensing at normal incidence of light with high sensitivity and FOM.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10306 - Optics (including laser optics and quantum optics)

Projekt

—

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2025

Kód důvěrnosti údajů

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

Název periodika

IEEE Sensors Journal

ISSN

1530-437X

e-ISSN

1558-1748

Svazek periodika

25

Číslo periodika v rámci svazku

7

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

9

Strana od-do

10992-11000

Kód UT WoS článku

001457909100003

EID výsledku v databázi Scopus

2-s2.0-105002583265