Localization of Narrowband Single Photon Emitters in Nanodiamonds

AbstractDue to small optical mode volumes and linear polarizations of surface-plasmon-polariton (SPP) resonant modes in metallic antennas, it is very difficult to obtain complex emission patterns and polarizations for single-photon emitters. Herein, nonresonant enhancement in a silver nanowire is used to both enhance emission rates and extract a z-oriented dipole, and then the symmetry of metallic nanostructures is proposed to tailor the patterns and polarizations of single-photon emission. The emission pattern of a quantum dot located close to a metallic nanostructure with a symmetric axis is split into multiple flaps. The number of splitting flaps is equal to the order of the symmetric axis. Moreover, the electric vectors of the emitted photons become centrally symmetric about the symmetric axis. The above phenomena are well explained by both a simulation and an image dipole model. The structural-symmetry-tailoring mechanism may open up a new avenue in the design of multifunctional and novel quantum-plasmonic devices.

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Radiative properties of quantum emitters in boron nitride from excited state calculations and Bayesian analysis

npj Computational Materials ◽

10.1038/s41524-021-00544-2 ◽

2021 ◽

Vol 7 (1) ◽

Author(s):

Shiyuan Gao ◽

Hsiao-Yi Chen ◽

Marco Bernardi

Keyword(s):

Boron Nitride ◽

Density Functional ◽

Single Photon ◽

Radiative Lifetime ◽

Radiative Properties ◽

Data Set ◽

Radiative Lifetimes ◽

Emission Energy ◽

Single Photon Emitters ◽

Quantum Emitters

AbstractPoint defects in hexagonal boron nitride (hBN) have attracted growing attention as bright single-photon emitters. However, understanding of their atomic structure and radiative properties remains incomplete. Here we study the excited states and radiative lifetimes of over 20 native defects and carbon or oxygen impurities in hBN using ab initio density functional theory and GW plus Bethe-Salpeter equation calculations, generating a large data set of their emission energy, polarization and lifetime. We find a wide variability across quantum emitters, with exciton energies ranging from 0.3 to 4 eV and radiative lifetimes from ns to ms for different defect structures. Through a Bayesian statistical analysis, we identify various high-likelihood charge-neutral defect emitters, among which the native VNNB defect is predicted to possess emission energy and radiative lifetime in agreement with experiments. Our work advances the microscopic understanding of hBN single-photon emitters and introduces a computational framework to characterize and identify quantum emitters in 2D materials.

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Single Photon Emitters Coupled to Plasmonic Waveguides: A Review

Advanced Quantum Technologies ◽

10.1002/qute.202100057 ◽

2021 ◽

Vol 4 (10) ◽

pp. 2100057

Author(s):

Shailesh Kumar ◽

Sergey I. Bozhevolnyi

Keyword(s):

Single Photon ◽

Plasmonic Waveguides ◽

Single Photon Emitters

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Ordered arrays of InGaN/GaN dot-in-a-wire nanostructures as single photon emitters

10.1117/12.2074898 ◽

2015 ◽

Cited By ~ 8

Author(s):

Snežana Lazić ◽

Ekaterina Chernysheva ◽

Žarko Gačević ◽

Noemi García-Lepetit ◽

Herko P. van der Meulen ◽

...

Keyword(s):

Single Photon ◽

Ordered Arrays ◽

Single Photon Emitters

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Engineering single photon emitters by ion implantation in diamond

Applied Physics Letters ◽

10.1063/1.3257976 ◽

2009 ◽

Vol 95 (18) ◽

pp. 181109 ◽

Cited By ~ 36

Author(s):

B. Naydenov ◽

R. Kolesov ◽

A. Batalov ◽

J. Meijer ◽

S. Pezzagna ◽

...

Keyword(s):

Ion Implantation ◽

Single Photon ◽

Single Photon Emitters

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InP1−xAsx quantum dots in InP nanowires: A route for single photon emitters

Journal of Crystal Growth ◽

10.1016/j.jcrysgro.2012.12.082 ◽

2013 ◽

Vol 378 ◽

pp. 519-523 ◽

Cited By ~ 12

Author(s):

Jean-Christophe Harmand ◽

Fauzia Jabeen ◽

Linsheng Liu ◽

Gilles Patriarche ◽

Karine Gauthron ◽

...

Keyword(s):

Quantum Dots ◽

Single Photon ◽

Single Photon Emitters

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Contact spacing controls the on-current for all-carbon field effect transistors

Communications Physics ◽

10.1038/s42005-021-00747-5 ◽

2021 ◽

Vol 4 (1) ◽

Author(s):

Ali Deniz Özdemir ◽

Pramit Barua ◽

Felix Pyatkov ◽

Frank Hennrich ◽

Yuan Chen ◽

...

Keyword(s):

Carbon Nanotube ◽

Field Effect ◽

Transport Model ◽

Field Effect Transistors ◽

Single Photon ◽

Great Promise ◽

Single Photon Emitters ◽

Gate Control ◽

Valence Bands ◽

Combine Carbon

AbstractAll-carbon field-effect transistors, which combine carbon nanotubes and graphene hold great promise for many applications such as digital logic devices and single-photon emitters. However, the understanding of the physical properties of carbon nanotube (CNT)/graphene hybrid systems in such devices remained limited. In this combined experimental and theoretical study, we use a quantum transport model for field-effect transistors based on graphene electrodes and CNT channels to explain the experimentally observed low on currents. We find that large graphene/CNT spacing and short contact lengths limit the device performance. We have also elucidated in this work the experimentally observed ambipolar transport behavior caused by the flat conduction- and valence-bands and describe non-ideal gate-control of the contacts and channel region by the quantum capacitance of graphene and the carbon nanotube. We hope that our insights will accelerate the design of efficient all-carbon field-effect transistors.

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