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Conference on Lasers and Electro-Optics

Strongly Extended Superradiance in Diamond Metamaterials

Olivia Mello, Yang Li, Philip Camayd-Muñoz, Cleaven Chia, I-Chun Huang, Marko Lončar, Eric Mazur

Published Jan 1, 2017• 3 citations
Publisher

Abstract

Zero index metamaterials (ZIM) experience near-perfect spatial coherence and infinite spatial wavelength. We model, through both analytical calculations and simulations, superradiant emission of silicon vacancy centers (SiV) in a diamond ZIM that extends well beyond the emission wavelength near 737 nm.
DOI
10.1364/cleo_at.2017.jtu5a.26

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Photoluminescence (PL) spectra of single silicon vacancy (SiV) centers in diamond frequently feature very narrow room temperature PL lines in the near-infrared (NIR) spectral region, mostly between 820 nm and 840 nm, in addition to the well known zero-phonon line (ZPL) at approximately 738 nm [E. Neu et al., Phys. Rev. B 84, 205211 (2011)]. We here exemplarily prove for a single SiV center that this NIR PL is due to an additional purely electronic transition (ZPL). For the NIR line at 822.7 nm, we find a room temperature linewidth of 1.4 nm (2.6 meV). The line saturates at similar excitation power as the ZPL. The ZPL and NIR line exhibit identical polarization properties. Cross-correlation measurements between the ZPL and the NIR line reveal anticorrelated emission and prove that the lines originate from a single SiV center, furthermore indicating a fast switching between the transitions (0.7 ns). g(2){g}^{(2)}g(2) autocorrelation measurements exclude that the NIR line is a vibronic sideband or that it arises due to a transition from/to a metastable (shelving) state.