Optical Time Reversal from Time-Dependent Epsilon-Near-Zero Media

Vezzoli, Stefano; Bruno, Vincenzo; DeVault, Clayton; Roger, Thomas; Shalaev, Vladimir M.; Boltasseva, Alexandra; Ferrera, Marcello; Clerici, Matteo; Dubietis, Audrius; Faccio, Daniele

doi:10.1103/physrevlett.120.043902

Optical Time Reversal from Time-Dependent Epsilon-Near-Zero Media

Journal Article · Thu Jan 25 23:00:00 EST 2018 · Physical Review Letters

DOI:https://doi.org/10.1103/physrevlett.120.043902· OSTI ID:1541275

Vezzoli, Stefano ^[1]; Bruno, Vincenzo ^[2]; DeVault, Clayton ^[3]; Roger, Thomas ^[2]; Shalaev, Vladimir M. ^[4]; Boltasseva, Alexandra ^[4]; Ferrera, Marcello ^[2]; Clerici, Matteo ^[5]; Dubietis, Audrius ^[6]; Faccio, Daniele ^[7]

Heriot-Watt Univ., Edinburgh (United Kingdom). Inst. of Photonics and Quantum Sciences; DOE/OSTI
Heriot-Watt Univ., Edinburgh (United Kingdom). Inst. of Photonics and Quantum Sciences
Purdue Univ., West Lafayette, IN (United States). Dept. of Physics and Astronomy. Birck Nanotechnology Center
Purdue Univ., West Lafayette, IN (United States). School of Electrical and Computer Engineering. Birck Nanotechnology Center
Univ. of Glasgow, Scotland (United Kingdom). School of Engineering
Vilnius Univ. (Lithuania). Laser Research Center
Heriot-Watt Univ., Edinburgh (United Kingdom). Inst. of Photonics and Quantum Sciences; Univ. of Glasgow, Scotland (United Kingdom). School of Physics and Astronomy

Materials with a spatially uniform but temporally varying optical response have applications ranging from magnetic field-free optical isolators to fundamental studies of quantum field theories. However, these effects typically become relevant only for time variations oscillating at optical frequencies, thus presenting a significant hurdle that severely limits the realization of such conditions. Here we present a thin-film material with a permittivity that pulsates (uniformly in space) at optical frequencies and realizes a time-reversing medium of the form originally proposed by Pendry [Science 322, 71 (2008)]. We use an optically pumped, 500 nm thick film of epsilon-near-zero (ENZ) material based on Al-doped zinc oxide. An incident probe beam is both negatively refracted and time reversed through a reflected phase-conjugated beam. As a result of the high nonlinearity and the refractive index that is close to zero, the ENZ film leads to time reversed beams (simultaneous negative refraction and phase conjugation) with near-unit efficiency and greater-than-unit internal conversion efficiency. The ENZ platform therefore presents the time-reversal features required, e.g., for efficient subwavelength imaging, all-optical isolators and fundamental quantum field theory studies.

View Accepted Manuscript (DOE)

Research Organization:: Purdue Univ., West Lafayette, IN (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: SC0017717

OSTI ID:: 1541275

Alternate ID(s):: OSTI ID: 1418185

Journal Information:: Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 4 Vol. 120; ISSN 0031-9007

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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