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Proceedings Paper

On-chip photoswitchable microresonator using azo monolayers
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Paper Abstract

Photoswitchable organic molecules can undergo reversible structural changes, with an external light stimulus. These special molecules have found uses in the development of “smart”polymers, optical writing of grating films, and even controllable in-vivo drug release. Traditional photoswitchable small molecules include azobenzenes, spiropyrans, diarylethenes, and a whole host of their derivatives. These classes of molecules can either photoisomerize or undergo reversible ring opening, respectively. Being the simplest class of photoswitches in terms of structure, azobenzenes have become the most ubiquitous, well-characterized, and implemented organic molecular switch. In this work, an azobenzene derivative is utilized and covalently attached to the surface of a silica microtoroidal optical resonator and is used to tune the resonance around fifty percent of the cavity’s free spectral range. An evanescently coupled 1300nm laser is used as the probe wavelength to monitor the trans-cis isomerization initiated by a 450nm laser source which is also coupled into the device. Results and kinetics are compared to UV-Vis spectroscopy and ellipsometry, and the tuning sensitivity is compared to other established methods in the literature.

Paper Details

Date Published: 30 August 2019
PDF: 6 pages
Proc. SPIE 11098, Molecular and Nano Machines II, 110980N (30 August 2019); doi: 10.1117/12.2538108
Show Author Affiliations
Andre Kovach, The Univ. of Southern California (United States)
Jinghan He, The Univ. of Southern California (United States)
Andrea M. Armani, The Univ. of Southern California (United States)

Published in SPIE Proceedings Vol. 11098:
Molecular and Nano Machines II
Zouheir Sekkat; Takashige Omatsu, Editor(s)

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