Refractometric sensing of Li salt with visible-light Si3N4 microdisk resonators

被引：16

作者：

Doolin, C. ^{[1
]}

Doolin, P. ^{[1
]}

Lewis, B. C. ^{[1
]}

Davis, J. P. ^{[1
]}

机构：

[1] Univ Alberta, Dept Phys, Edmonton, AB T6G 2E1, Canada

来源：

APPLIED PHYSICS LETTERS | 2015年 / 106卷 / 08期

基金：

加拿大自然科学与工程研究理事会; 加拿大创新基金会;

关键词：

WHISPERING-GALLERY MODE; SILICON-ON-INSULATOR; LABEL-FREE DETECTION; MICRORING RESONATOR; OPTICAL MICROCAVITIES; VIRUS DETECTION; DISK RESONATOR; RING-RESONATOR; SENSORS; BIOSENSOR;

D O I：

10.1063/1.4913618

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

We demonstrate aqueous refractive index sensing with 15-30 mu m diameter silicon nitride microdisk resonators to detect small concentrations of Li salt. A dimpled-tapered fiber is used to couple 780 nm visible light to the microdisks, in order to perform spectroscopy on their optical resonances. The dimpled fiber probe allows testing of multiple devices on a chip in a single experiment. This sensing system is versatile and easy to use, while remaining competitive with other refractometric sensors. For example, from a 20 mu m diameter device we measure a sensitivity of 230+/-20 nm/refractive index units (RIU) with a loaded quality factor of 1.5 x 10(4), and a limit of detection down to (1.3+/-0.1) x 10(-6) RIU. (C) 2015 AIP Publishing LLC.

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页数：4

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