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Telecom-Wavelength Single-Photon Emitters in Multilayer InSe
Huan Zhao1,2, Saban M Hus1, Jinli Chen3
1Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United States.
ACS Nano
|February 13, 2025
Summary
Researchers developed efficient single-photon emitters using 2D indium selenide and nanopillars for quantum technologies. These emitters operate at telecom wavelengths, crucial for quantum information science advancements.
Area of Science:
- Quantum Information Science
- Materials Science
- Nanotechnology
Background:
- Single-photon emitters (SPEs) operating at telecom wavelengths are essential for quantum information science.
- Two-dimensional (2D) materials offer high photon extraction efficiency and integration potential for photonic circuits.
- Existing SPEs often face challenges in efficiency, tunability, and integration.
Purpose of the Study:
- To demonstrate the creation of robust and efficient SPEs in the 1000-1550 nm telecom range.
- To investigate the use of 2D indium selenide (InSe) coupled with strain-inducing nanopillar arrays for SPEs.
- To understand the factors influencing emission wavelength and the origin of single-photon emission.
Main Methods:
- Fabrication of SPEs by coupling 2D InSe with strain-inducing nanopillar arrays.
- Characterization of optical emission properties, including wavelength dependence on material thickness.
- Photon antibunching measurements using Hanbury Brown and Twiss experiments at 10 K.
- Theoretical analysis using density-functional theory (DFT) and experimental analysis via scanning tunneling microscopy (STM).
Main Results:
- Successfully created SPEs emitting in the 1000-1550 nm near-infrared range.
- Demonstrated a strong dependence of emission wavelength on the number of InSe layers.
- Confirmed the single-photon nature of the emissions through clear photon antibunching signatures.
- DFT and STM analyses provided insights into the electronic structure and defect origins of the SPEs.
Conclusions:
- 2D InSe coupled with nanopillar arrays is a viable platform for efficient, telecom-wavelength SPEs.
- The layer-dependent emission wavelength offers a pathway for tuning SPE characteristics.
- The developed SPEs hold significant promise for integration into quantum information processing and communication systems.
