Thermo-optoplasmonic single-molecule sensing on optical microcavities
Thermo-optoplasmonic single-molecule sensing on optical microcavities
复制标题
光学微腔热光等离子体单分子传感
DOI:
10.1101/2023.12.13.571444
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发表时间:
2023
期刊:
影响因子:
--
通讯作者:
Toropov N
中科院分区:
文献类型:
--
作者:
Toropov N
Whispering-gallery-mode (WGM) resonators are powerful instruments for single-molecule sensing in biological and biochemical investigations. WGM sensors leveraged by plasmonic nanostructures, known as optoplasmonic sensors, provide sensitivity down to single atomic ions. In this article, we describe that the response of optoplasmonic sensors upon the attachment of single protein molecules strongly depends on the intensity of WGM. At low intensity, protein binding causes red shifts of WGM resonance wavelengths, known as the reactive sensing mechanism. By contrast, blue shifts are obtained at high intensities, which we explain as thermo-optoplasmonic (TOP) sensing, where molecules transform absorbed WGM radiation into heat. To support our conclusions, we experimentally investigated seven molecules and complexes; we observed blue shifts for dye molecules, amino acids, and anomalous absorption of enzymes in the near-infrared spectral region. As an example of an application, we propose a physical model of TOP sensing that can be used for the development of single-molecule absorption spectrometers.
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