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High Q optical resonances of polystyrene microspheres in water controlled by optical tweezers

Lutti, Julie, Langbein, Wolfgang Werner and Borri, Paola 2007. High Q optical resonances of polystyrene microspheres in water controlled by optical tweezers. Applied Physics Letters 91 (14) , 141116. 10.1063/1.2795332

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Using evanescent field coupling via frustrated total internal reflection, we measured whispering-gallery optical resonances of polystyrene microspheres held in aqueous buffer by optical tweezers, as a function of the distance from the planar coupling substrate. An intrinsic Q factor of 4×106 was found for a microsphere of 30 μm diameter, indicating the potential of such microresonators for highly sensitive biomolecular detection. These measurements provide an upper limit of 2×10−7 for the imaginary part of the complex refractive index of polystyrene at 770 nm wavelength.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Physics and Astronomy
Subjects: Q Science > QC Physics
Uncontrolled Keywords: micromechanical resonators, optical resonators, polymers, radiation pressure, refractive index, water, whispering gallery modes
Additional Information: Pdf uploaded in accordance with publisher's policy at (accessed 20/02/2014).
Publisher: American Institute of Physics
ISSN: 0003-6951
Date of First Compliant Deposit: 30 March 2016
Last Modified: 13 May 2019 20:38

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