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C: Physical Processes in Nanomaterials and Nanostructures
Optomechanical Thermometry of Nanoribbon Cantilevers Anupum Pant, Bennett E Smith, Matthew J. Crane, Xuezhe Zhou, Matthew B. Lim, Stuart Frazier, E. James Davis, and Peter J. Pauzauskie J. Phys. Chem. C, Just Accepted Manuscript • DOI: 10.1021/acs.jpcc.8b00365 • Publication Date (Web): 12 Mar 2018 Downloaded from http://pubs.acs.org on March 12, 2018
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The Journal of Physical Chemistry
Optomechanical Thermometry of Nanoribbon Cantilevers Anupum Pant,†,k Bennett E. Smith,‡,k Matthew J. Crane,¶ Xuezhe Zhou,† Matthew B. Lim,† Stuart Frazier,† E. James Davis,¶ and Peter J. Pauzauskie∗,†,§ †Materials Science and Engineering Department, University of Washington, Seattle, Washington 98195-2120, United States ‡Chemistry Department, University of Washington, Seattle, Washington 98195-2120, United States ¶Chemical Engineering Department, University of Washington, Seattle, Washington 98195-2120, United States §Physical & Computational Sciences Directorate, Pacific Northwest National Laboratory, Richland, WA 99352, USA kContributed equally to this work E-mail:
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Abstract Cadmium sulfide (CdS) nanostructures have attracted a significant amount of attention for a variety of optoelectronic applications including photovoltaic cells, semiconductor lasers, and solid-state laser refrigeration due to their direct bandgap around 2.42 eV and high radiative quantum efficiency. Nanoribbons (NRs) of CdS have been claimed to laser cool following excitation at 514 and 532 nm wavelengths by the annihilation of optical phonons during anti-Stokes photoluminescence. To explore this claim, we demonstrate a novel optomechanical experimental technique for micro-thermometry of a CdSNR cantilever using Young’s modulus as the primary temperature-dependent observable. Measurements of the cantilever’s fundamental acoustic eigenfrequency at low laser powers showed a red-shift in the eigenfrequency with increasing power, suggesting net heating. At high laser powers, a decrease in the rate of red-shift of the eigenfrequency is explained using Euler-Bernoulli elastic beam theory, considering Hookean optical-trapping force. A predicted imaginary refractive index for CdSNR based on experimental temperature measurement agrees well with a heat transfer analysis that predicts the temperature distribution within the cantilever and the time required to reach steady state (
