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Optics Letters

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  • Editor: Alan E. Willner
  • Vol. 38, Iss. 15 — Aug. 1, 2013
  • pp: 2726–2728

Hybrid optical antenna with high directivity gain

Alireza Bonakdar and Hooman Mohseni  »View Author Affiliations


Optics Letters, Vol. 38, Issue 15, pp. 2726-2728 (2013)
http://dx.doi.org/10.1364/OL.38.002726


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Abstract

Coupling of a far-field optical mode to electronic states of a quantum absorber or emitter is a crucial process in many applications, including infrared sensors, single molecule spectroscopy, and quantum metrology. In particular, achieving high quantum efficiency for a system with a deep subwavelength quantum absorber/emitter has remained desirable. In this Letter, a hybrid optical antenna based on coupling of a photonic nanojet to a metallo-dielectric antenna is proposed, which allows such efficient coupling. A quantum efficiency of about 50% is predicted for a semiconductor with volume of λ3/170. Despite the weak optical absorption coefficient of 2000cm1 in the long infrared wavelength of 8μm, very strong far-field coupling has been achieved, as evidenced by an axial directivity gain of 16 dB, which is only 3 dB below of theoretical limit. Unlike the common phased array antenna, this structure does not require coherent sources to achieve a high directivity. The quantum efficiency and directivity gain are more than an order of magnitude higher than existing metallic, dielectric, or metallo-dielectric optical antenna.

© 2013 Optical Society of America

OCIS Codes
(040.0040) Detectors : Detectors
(040.5160) Detectors : Photodetectors
(040.5570) Detectors : Quantum detectors
(040.6070) Detectors : Solid state detectors
(080.3630) Geometric optics : Lenses
(110.3080) Imaging systems : Infrared imaging

ToC Category:
Detectors

History
Original Manuscript: March 26, 2013
Revised Manuscript: June 6, 2013
Manuscript Accepted: June 26, 2013
Published: July 24, 2013

Citation
Alireza Bonakdar and Hooman Mohseni, "Hybrid optical antenna with high directivity gain," Opt. Lett. 38, 2726-2728 (2013)
http://www.opticsinfobase.org/ol/abstract.cfm?URI=ol-38-15-2726

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