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Applied Optics

Applied Optics


  • Editor: Joseph N. Mait
  • Vol. 52, Iss. 22 — Aug. 1, 2013
  • pp: 5420–5425

Photonic nanojet-enhanced nanometer-scale germanium photodiode

Mehdi Hasan and Jamesina J. Simpson  »View Author Affiliations

Applied Optics, Vol. 52, Issue 22, pp. 5420-5425 (2013)

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A design challenge for photodiodes yielding both high speed and responsivity is the necessity to concentrate incident light into a subwavelength active volume region. Photonic nanojets have been reported in the literature as a means to focus an incident plane wave to a subwavelength-waist propagating beam with applications ranging from next-generation DVDs to characterizing subwavelength features within dielectric targets. In the present work, a new application of photonic nanojets is proposed, focusing electromagnetic energy into a photodiode. Three-dimensional finite-difference time-domain solutions are conducted to determine the advantages of photonic nanojet-enhanced photodiodes at near-infrared wavelengths (1310 nm). We find that photonic nanojets provide a factor of 26 increase in the volume-integrated electric field within the subwavelength active volume of the photodiode of size 0.0045μm3. Furthermore, this increase is achieved independent of the incident polarization and over a broad bandwidth. Photonic nanojets may thus serve as an attractive alternative to plasmonics for some applications.

© 2013 Optical Society of America

OCIS Codes
(040.0040) Detectors : Detectors
(040.5160) Detectors : Photodetectors

ToC Category:
Optical Devices

Original Manuscript: April 23, 2013
Revised Manuscript: June 25, 2013
Manuscript Accepted: June 26, 2013
Published: July 24, 2013

Mehdi Hasan and Jamesina J. Simpson, "Photonic nanojet-enhanced nanometer-scale germanium photodiode," Appl. Opt. 52, 5420-5425 (2013)

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