Hyperbolic optics and superlensing in room-temperature KTN from self-induced k-space topological transitions

Yehonatan Gelkop, Fabrizio Mei, Sagi Frishman, Yehudit Garcia, Ludovica Falsi, Galina Perepelitsa, Claudio Conti, Eugenio DelRe () and Aharon J. Agranat
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Yehonatan Gelkop: The Hebrew University
Fabrizio Mei: Università di Roma “La Sapienza”
Sagi Frishman: The Hebrew University
Yehudit Garcia: The Hebrew University
Ludovica Falsi: Università di Roma “La Sapienza”
Galina Perepelitsa: The Hebrew University
Claudio Conti: Università di Roma “La Sapienza”
Eugenio DelRe: Università di Roma “La Sapienza”
Aharon J. Agranat: The Hebrew University

Nature Communications, 2021, vol. 12, issue 1, 1-7

Abstract: Abstract A hyperbolic medium will transfer super-resolved optical waveforms with no distortion, support negative refraction, superlensing, and harbor nontrivial topological photonic phases. Evidence of hyperbolic effects is found in periodic and resonant systems for weakly diffracting beams, in metasurfaces, and even naturally in layered systems. At present, an actual hyperbolic propagation requires the use of metamaterials, a solution that is accompanied by constraints on wavelength, geometry, and considerable losses. We show how nonlinearity can transform a bulk KTN perovskite into a broadband 3D hyperbolic substance for visible light, manifesting negative refraction and superlensing at room-temperature. The phenomenon is a consequence of giant electro-optic response to the electric field generated by the thermal diffusion of photogenerated charges. Results open new scenarios in the exploration of enhanced light-matter interaction and in the design of broadband photonic devices.

Date: 2021
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DOI: 10.1038/s41467-021-27466-3

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