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Optics Express

Optics Express

  • Editor: Andrew M. Weiner
  • Vol. 21, Iss. 25 — Dec. 16, 2013
  • pp: 30778–30795

Bound-to-continuum absorption with tunneling in type-II nanostructures: a multiband source-radiation approach

Chi-Ti Hsieh and Shu-Wei Chang  »View Author Affiliations


Optics Express, Vol. 21, Issue 25, pp. 30778-30795 (2013)
http://dx.doi.org/10.1364/OE.21.030778


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Abstract

We convert calculations of the bound-to-continuum absorption in type-II semiconductor quantum wells into an equivalent source-radiation problem under the effective-mass approximation with band mixing. Perfectly matched layers corresponding to the eight-band Luttinger-Kohn Hamiltonian are introduced to incorporate the effect of quasi-bound states in open regions. In this way, the interplay between quantum tunneling and optical transitions is fully taken into account. From resulted lineshapes of the Fano resonance, we can evaluate tunneling rates of these metastable states and related absorption strengths relative to those of the continuum. The approach here is useful in estimations of carrier extraction rates from type-II nanostructures for photovoltaic applications.

© 2013 Optical Society of America

OCIS Codes
(040.4200) Detectors : Multiple quantum well
(040.5350) Detectors : Photovoltaic
(160.4760) Materials : Optical properties

ToC Category:
Detectors

History
Original Manuscript: August 22, 2013
Revised Manuscript: November 3, 2013
Manuscript Accepted: November 24, 2013
Published: December 6, 2013

Citation
Chi-Ti Hsieh and Shu-Wei Chang, "Bound-to-continuum absorption with tunneling in type-II nanostructures: a multiband source-radiation approach," Opt. Express 21, 30778-30795 (2013)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-21-25-30778


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