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

Lutti, Julie, Langbein, Wolfgang Werner ORCID: https://orcid.org/0000-0001-9786-1023 and Borri, Paola ORCID: https://orcid.org/0000-0002-7873-3314 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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Abstract

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 http://www.sherpa.ac.uk/romeo/issn/0003-6951/ (accessed 20/02/2014).
Publisher:	American Institute of Physics
ISSN:	0003-6951
Date of First Compliant Deposit:	30 March 2016
Last Modified:	10 Jul 2024 19:16
URI:	https://orca.cardiff.ac.uk/id/eprint/48797

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