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Optical gating of photoluminescence from color centers in hexagonal boron nitride

Optical gating of photoluminescence from color centers in hexagonal boron nitride
Optical gating of photoluminescence from color centers in hexagonal boron nitride
We report on multicolor excitation experiments with color centers in hexagonal boron nitride at cryogenic temperatures. We demonstrate controllable optical switching between bright and dark states of color centers emitting around 2 eV. Resonant, or quasi-resonant, excitation of photoluminescence also pumps the color center, via a two-photon process, into a dark state, where it becomes trapped. Repumping back into the bright state has a step-like spectrum with a defect-dependent threshold between 2.25 and 2.6 eV. This behavior is consistent with photoionization and charging between optically bright and dark states of the defect. Furthermore, a second zero phonon line, detuned by +0.4 eV, is observed in absorption with orthogonal polarization to the emission, evidencing an additional energy level in the color center
2D materials, Color center, hexagonal boron-nitride, single photon source
1530-6984
4256-4263
Khatri, Prince
9102d03d-12bc-4bca-ab2c-f4238866db60
Ramsay, Andrew
741a4a8e-189a-4dee-8074-cc481983d6e3
Malein, Ralph
a94b4b89-1b0b-4064-aa6d-47cde891707f
Chong, Harold
795aa67f-29e5-480f-b1bc-9bd5c0d558e1
Luxmoore, Isaac
7554de43-acbb-4027-9fe3-72fad0bff17c
Khatri, Prince
9102d03d-12bc-4bca-ab2c-f4238866db60
Ramsay, Andrew
741a4a8e-189a-4dee-8074-cc481983d6e3
Malein, Ralph
a94b4b89-1b0b-4064-aa6d-47cde891707f
Chong, Harold
795aa67f-29e5-480f-b1bc-9bd5c0d558e1
Luxmoore, Isaac
7554de43-acbb-4027-9fe3-72fad0bff17c

Khatri, Prince, Ramsay, Andrew, Malein, Ralph, Chong, Harold and Luxmoore, Isaac (2020) Optical gating of photoluminescence from color centers in hexagonal boron nitride. Nano Letters, 20 (6), 4256-4263. (doi:10.1021/acs.nanolett.0c00751).

Record type: Article

Abstract

We report on multicolor excitation experiments with color centers in hexagonal boron nitride at cryogenic temperatures. We demonstrate controllable optical switching between bright and dark states of color centers emitting around 2 eV. Resonant, or quasi-resonant, excitation of photoluminescence also pumps the color center, via a two-photon process, into a dark state, where it becomes trapped. Repumping back into the bright state has a step-like spectrum with a defect-dependent threshold between 2.25 and 2.6 eV. This behavior is consistent with photoionization and charging between optically bright and dark states of the defect. Furthermore, a second zero phonon line, detuned by +0.4 eV, is observed in absorption with orthogonal polarization to the emission, evidencing an additional energy level in the color center

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More information

Accepted/In Press date: 5 May 2020
e-pub ahead of print date: 8 May 2020
Keywords: 2D materials, Color center, hexagonal boron-nitride, single photon source

Identifiers

Local EPrints ID: 440911
URI: http://eprints.soton.ac.uk/id/eprint/440911
ISSN: 1530-6984
PURE UUID: 5ec49802-0f0c-43be-b1f9-3d72f5b96bb7
ORCID for Harold Chong: ORCID iD orcid.org/0000-0002-7110-5761

Catalogue record

Date deposited: 22 May 2020 16:37
Last modified: 26 Nov 2021 02:52

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Contributors

Author: Prince Khatri
Author: Andrew Ramsay
Author: Ralph Malein
Author: Harold Chong ORCID iD
Author: Isaac Luxmoore

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