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Proceedings Paper

Metasurfaces for enhanced nonlinear optics and quantum imaging (Conference Presentation)
Author(s): Daniele Faccio

Paper Abstract

Recent advances in material science have led to the development of materials that exhibit remarkably strong light-matter coupling. We will discuss two examples. The first is related to the new wave of discoveries based on materials that have zero (real) permittivity and a low imaginary part, so that the real part of the refractive index is also close to zero. These “epsilon near zero” (ENZ) materials have been used to show nonlinear Kerr (i.e. transient and nearly instantaneous light-induced) refractive variations of the order of unity and thus several orders of magnitude higher than in any other materials. These effects have been demonstrated in very thin, submicron-scale films of transparent oxide materials such as ITO and AZO and could therefore lead to very compact devices. We have also studied four-wave-mixing processes, uncovering even larger enhancements due to the low refractive index, with the first observation of a net internal gain n the generation of a negatively refracted beam from a subwavelength film. This allows to implement, for example, the ideal conditions required for a time-reversing and perfect imaging film as originally described by Pendry. The second topic will focus on the opposite intensity regime, i.e. single photon and quantum optics with metasurfaces. We have shown that polarisation sensitive metasurfaces can be used in combination with entangled photon pairs to nonlocally control the image generated by the metasurface. We will discuss ongoing work aimed at using metasurfaces to fully characterise quantum states of light and quantify the degree of entanglement.

Paper Details

Date Published: 17 September 2018
Proc. SPIE 10719, Metamaterials, Metadevices, and Metasystems 2018, 107191N (17 September 2018); doi: 10.1117/12.2319674
Show Author Affiliations
Daniele Faccio, Univ. of Glasgow (United Kingdom)

Published in SPIE Proceedings Vol. 10719:
Metamaterials, Metadevices, and Metasystems 2018
Nader Engheta; Mikhail A. Noginov; Nikolay I. Zheludev, Editor(s)

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