Silver-coated whispering gallery mode resonator for bio-sensing applications

Huda Adnan Zain; Sulaiman Wadi Harun; Malathy Batumalay; Hazli Rafis A. Rahim; Retna Apsari

doi:10.1007/s11801-025-4149-y

Silver-coated whispering gallery mode resonator for bio-sensing applications

Huda Adnan Zain
, Sulaiman Wadi Harun^*
, Malathy Batumalay
, Hazli Rafis A. Rahim
, Retna Apsari

^*Corresponding author for this work

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

Abstract

This paper presents a biosensor utilizing a whispering gallery mode (WGM) resonator characterized by azimuthal symmetry and crescent-shaped coatings of silver. The study investigates the impact of the coupling gap on the extinction ratio and Q-factor of the setup. The resonator is coated with silver in crescent shapes, ranging from 40 nm to 65 nm in thickness. Coupling is achieved with a silica waveguide, simulating the tapered fiber coupling method. Notably, the resonator exhibits a maximum sensitivity of 220 nm/RIU when coated with 55-nm-thick silver in conjunction with a 4-nm-thick layer of thiol-tethered deoxyribonucleic acid (DNA). This biosensor holds promise for biomolecule detection applications.

Original language	English
Pages (from-to)	711-715
Number of pages	5
Journal	Optoelectronics Letters
Volume	21
Issue number	12
DOIs	https://doi.org/10.1007/s11801-025-4149-y
State	Published - Dec 2025
Externally published	Yes

Bibliographical note

Publisher Copyright:
© Tianjin University of Technology 2025.

Keywords

A

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Atomic and Molecular Physics, and Optics
Condensed Matter Physics
Electrical and Electronic Engineering

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abstract = "This paper presents a biosensor utilizing a whispering gallery mode (WGM) resonator characterized by azimuthal symmetry and crescent-shaped coatings of silver. The study investigates the impact of the coupling gap on the extinction ratio and Q-factor of the setup. The resonator is coated with silver in crescent shapes, ranging from 40 nm to 65 nm in thickness. Coupling is achieved with a silica waveguide, simulating the tapered fiber coupling method. Notably, the resonator exhibits a maximum sensitivity of 220 nm/RIU when coated with 55-nm-thick silver in conjunction with a 4-nm-thick layer of thiol-tethered deoxyribonucleic acid (DNA). This biosensor holds promise for biomolecule detection applications.",

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doi = "10.1007/s11801-025-4149-y",

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AU - Zain, Huda Adnan

AU - Harun, Sulaiman Wadi

AU - Batumalay, Malathy

AU - Rahim, Hazli Rafis A.

AU - Apsari, Retna

PY - 2025/12

Y1 - 2025/12

N2 - This paper presents a biosensor utilizing a whispering gallery mode (WGM) resonator characterized by azimuthal symmetry and crescent-shaped coatings of silver. The study investigates the impact of the coupling gap on the extinction ratio and Q-factor of the setup. The resonator is coated with silver in crescent shapes, ranging from 40 nm to 65 nm in thickness. Coupling is achieved with a silica waveguide, simulating the tapered fiber coupling method. Notably, the resonator exhibits a maximum sensitivity of 220 nm/RIU when coated with 55-nm-thick silver in conjunction with a 4-nm-thick layer of thiol-tethered deoxyribonucleic acid (DNA). This biosensor holds promise for biomolecule detection applications.

AB - This paper presents a biosensor utilizing a whispering gallery mode (WGM) resonator characterized by azimuthal symmetry and crescent-shaped coatings of silver. The study investigates the impact of the coupling gap on the extinction ratio and Q-factor of the setup. The resonator is coated with silver in crescent shapes, ranging from 40 nm to 65 nm in thickness. Coupling is achieved with a silica waveguide, simulating the tapered fiber coupling method. Notably, the resonator exhibits a maximum sensitivity of 220 nm/RIU when coated with 55-nm-thick silver in conjunction with a 4-nm-thick layer of thiol-tethered deoxyribonucleic acid (DNA). This biosensor holds promise for biomolecule detection applications.

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JF - Optoelectronics Letters

IS - 12

ER -

Silver-coated whispering gallery mode resonator for bio-sensing applications

Abstract

Bibliographical note

Keywords

ASJC Scopus subject areas

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