Micro/nanoscale radiation energy transfer is investigated in optical microcavity and waveguide coupling structures working on whispering-gallery mode optical resonances. The finite element method is employed for solving the Helmholtz equations that govern the energy transfer and time-harmonics electromagnetic (EM) wave propagation. The maximum element size concept is introduced for the numerically sensitive subdomains where local mesh refining is needed because of the presence of intensified EM fields. The results show that the energy storage capability of a resonant microcavity is predominantly determined by the cavity size. The stored energy in the diameter microcavity considered is several orders of magnitude larger than that in the diameter microcavity. The gap between a microcavity and its light-delivery waveguide has a substantial effect on the energy coupling from the waveguide to the microcavity and consequently influences significantly energy storage in the microcavity. An optimal gap is found for maximum energy storage and most efficient energy coupling. This optimal gap dimension depends not only on the configurations of the microcavity and waveguide, but also on the resonance wavelength. With increasing gap the quality factor increases exponentially and quickly saturates as the gap approaches to one wavelength involved. The submicron/nanoscale gap is crucial for generating quality resonances as well as for efficient energy transfer and coupling.
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Technical Papers
Energy Transfer to Optical Microcavities With Waveguides
Zhixiong Guo,
Zhixiong Guo
Mem. ASME
Department of Mechanical and Aerospace Engineering,
e-mail: guo@jove.rutgers.edu
Rutgers, The State University of New Jersey
, 98 Brett Road, Piscataway, NJ 08854
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Haiyong Quan
Haiyong Quan
Department of Mechanical and Aerospace Engineering,
Rutgers, The State University of New Jersey
, 98 Brett Road, Piscataway, NJ 08854
Search for other works by this author on:
Zhixiong Guo
Mem. ASME
Department of Mechanical and Aerospace Engineering,
Rutgers, The State University of New Jersey
, 98 Brett Road, Piscataway, NJ 08854e-mail: guo@jove.rutgers.edu
Haiyong Quan
Department of Mechanical and Aerospace Engineering,
Rutgers, The State University of New Jersey
, 98 Brett Road, Piscataway, NJ 08854J. Heat Transfer. Jan 2007, 129(1): 44-52 (9 pages)
Published Online: July 21, 2006
Article history
Received:
February 6, 2006
Revised:
July 21, 2006
Citation
Guo, Z., and Quan, H. (July 21, 2006). "Energy Transfer to Optical Microcavities With Waveguides." ASME. J. Heat Transfer. January 2007; 129(1): 44–52. https://doi.org/10.1115/1.2401197
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