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Controllable coherent perfect absorption in a composite film |
Optics Express, Vol. 20, Issue 2, pp. 1330-1336 (2012)
http://dx.doi.org/10.1364/OE.20.001330
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Abstract
We exploit the versatility provided by metal–dielectric composites to demonstrate controllable coherent perfect absorption (CPA) or anti-lasing in a slab of heterogeneous medium. The slab is illuminated by coherent light from both sides, at the same angle of incidence and the conditions required for CPA are investigated as a function of the different system parameters. Our calculations clearly elucidate the role of absorption as a necessary prerequisite for CPA. We further demonstrate the controllability of the CPA frequency to the extent of having the same at two distinct frequencies even in presence of dispersion, rendering the realization of anti-lasers more flexible.
© 2012 OSA
OCIS Codes
(140.4780) Lasers and laser optics : Optical resonators
(240.0310) Optics at surfaces : Thin films
(260.3160) Physical optics : Interference
(160.1245) Materials : Artificially engineered materials
(260.2065) Physical optics : Effective medium theory
(140.3945) Lasers and laser optics : Microcavities
(140.3948) Lasers and laser optics : Microcavity devices
ToC Category:
Thin Films
History
Original Manuscript: November 21, 2011
Revised Manuscript: December 16, 2011
Manuscript Accepted: December 20, 2011
Published: January 6, 2012
Citation
Shourya Dutta-Gupta, O. J. F. Martin, S. Dutta Gupta, and G. S. Agarwal, "Controllable coherent perfect absorption in a composite film," Opt. Express 20, 1330-1336 (2012)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-20-2-1330
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