Giant frequency-selective near-field energy transfer in active-passive structures

Chinmay Khandekar, Weiliang Jin, Owen D. Miller, Adi Pick, Alejandro W. Rodriguez

Research output: Contribution to journalArticlepeer-review

15 Scopus citations


We apply a fluctuation electrodynamics framework in combination with semianalytical (dipolar) approximations to study amplified spontaneous energy transfer (ASET) between active and passive bodies. We consider near-field energy transfer between semi-infinite planar media and spherical structures (dimers and lattices) subject to gain, and show that the combination of loss compensation and near-field enhancement (achieved by the proximity, enhanced interactions, and tuning of subwavelength resonances) in these structures can result in orders of magnitude ASET enhancements below the lasing threshold. We examine various possible geometric configurations, including realistic materials, and describe optimal conditions for enhancing ASET, showing that the latter depends sensitively on both geometry and gain, enabling efficient and tunable gain-assisted energy extraction from structured surfaces.

Original languageAmerican English
Article number115402
JournalPhysical Review B
Issue number11
StatePublished - 1 Sep 2016
Externally publishedYes

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© 2016 American Physical Society.


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