Harmonic generation from metal surfaces and gratings: free electron spill-out layer as an epsilon-near-zero boundary layer (Conference Presentation)

Michael Scalora; Shroddha Mukhopadhyay; Laura Rodriguez-Sune; Kent A. Hallman; Maria Antonietta A. Vincenti; Domenico de Ceglia; Neset Akozbek; Josep F. Trull; Crina M. Cojocaru

doi:10.1117/12.2633407

3 October 2022 Harmonic generation from metal surfaces and gratings: free electron spill-out layer as an epsilon-near-zero boundary layer (Conference Presentation)

Michael Scalora, Shroddha Mukhopadhyay, Laura Rodriguez-Sune, Kent A. Hallman, Maria Antonietta A. Vincenti, Domenico de Ceglia, Neset Akozbek, Josep F. Trull, Crina M. Cojocaru

Author Affiliations +

Proceedings Volume PC12195, Metamaterials, Metadevices, and Metasystems 2022; PC121950S (2022) https://doi.org/10.1117/12.2633407
Event: SPIE Nanoscience + Engineering, 2022, San Diego, California, United States

Abstract

We discuss traditional second and third harmonic generation from metallic mirrors, gratings, and novel nonlinear optical properties of metal/vacuum interfaces. The boundary is a spillout region composed of free electrons having exponentially decreasing density that vanishes within an atomic diameter. Classical electrodynamics cannot discern field variations either between atoms or over the distance of a decaying wave function. The boundary consists of a single spatial discretization step, a function of unknown average density. This layer acts like an epsilon-near-zero material that enhances the local field by more than three orders of magnitude, alongside a dramatic decrease of nonlinear thresholds.

Conference Presentation

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Michael Scalora, Shroddha Mukhopadhyay, Laura Rodriguez-Sune, Kent A. Hallman, Maria Antonietta A. Vincenti, Domenico de Ceglia, Neset Akozbek, Josep F. Trull, and Crina M. Cojocaru "Harmonic generation from metal surfaces and gratings: free electron spill-out layer as an epsilon-near-zero boundary layer (Conference Presentation)", Proc. SPIE PC12195, Metamaterials, Metadevices, and Metasystems 2022, PC121950S (3 October 2022); https://doi.org/10.1117/12.2633407

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