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A Metasurface-based Diamond Frequency Converter Using Plasmonic Nanogap Resonators by Qixin Shen; Amirhassan Shams-Ansari; Andrew M. Boyce; Nathaniel C. Wilson; Tao Cai; Marko Loncar; Maiken H. Mikkelsen is a Engineering article available to read on EtoBox.

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## Abstract Diamond has attracted great interest as an appealing material for various applications ranging from classical to quantum optics. To date, Raman lasers, single photon sources, quantum sensing and quantum communication have been demonstrated with integrated diamond devices. However, studies of the nonlinear optical properties of diamond have been limited, especially at the nanoscale. Here, a metasurface consisting of plasmonic nanogap cavities is used to enhance both χ^(2)^ and χ^(3)^ nonlinear optical processes in a wedge-shaped diamond slab with a thickness down to 12 nm. Multiple nonlinear processes were enhanced simultaneously due to the relaxation of phase-matching conditions in subwavelength plasmonic structures by matching two excitation wavelengths with the fundamental and second-order modes of the nanogap cavities. Specifically, third-harmonic generation (THG) and second-harmonic generation (SHG) are both enhanced 1.6 × 10^7^-fold, while four-wave mixing is enhanced 3.0 × 10^5^-fold compared to diamond without the metasurface. Even though diamond lacks a bulk χ^(2)^ due to centrosymmetry, the observed SHG arises from the surface χ^(2)^ of the diamond slab and is

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Author

Qixin Shen; Amirhassan Shams-Ansari; Andrew M. Boyce; Nathaniel C. Wilson; Tao Cai; Marko Loncar; Maiken H. Mikkelsen

Publisher

Walter de Gruyter GmbH

Published

2020

Language

EN

Field

Engineering (Physical Sciences)