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<p>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 <i>Q</i>-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.</p>

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

  • 期刊论文

  • 发表日期：

    2025年11月19日

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

摘要

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.