Azzam Shaimaa I, Parto Kamyar, Moody Galan
Electrical and Computer Engineering Department, University of California, Santa Barbara, CA 93106, USA.
California Nanosystems Institute, University of California, Santa Barbara, CA 93106, USA.
Nanophotonics. 2023 Jan 16;12(3):477-484. doi: 10.1515/nanoph-2022-0628. eCollection 2023 Feb.
Two-dimensional (2D) materials have shown great promise as hosts for high-purity deterministic single-photon sources. In the last few years, the underlying physics of single photon emission in 2D materials have been uncovered, and their optical properties have been improved to meet criteria for a variety of quantum technologies and applications. In this work, we take advantage of the unique characteristics of dielectric nanoantennas in manipulating the electromagnetic response on a sub-wavelength scale to localize and control defect-based single-photon emitters (SPEs) in 2D layered materials. We show that dielectric nanoantennas are capable of inducing high Purcell enhancement >20 and therefore brighter single-photon emission, which is characterized by a reduction of the emitters' radiative lifetimes and enhancement of their brightness by more than an order of magnitude. We demonstrate that the sub-wavelength-scale dielectric nanoantennas can be designed to also impose a predetermined strain profile that determines the confinement potential of the SPE, leading to robust control over the optical polarization with up to 94% extinction ratio. The combination of large Purcell enhancement, polarization orientation, and site control through strain engineering demonstrates the advantages and unique capabilities of dielectric nanoantennas for enhancing the quantum optical properties of 2D SPEs for quantum information technologies.
二维（2D）材料作为高纯度确定性单光子源的宿主展现出了巨大潜力。在过去几年中，二维材料中单光子发射的基础物理原理已被揭示，并且它们的光学性质也得到了改善，以满足各种量子技术和应用的标准。在这项工作中，我们利用介电纳米天线在亚波长尺度上操纵电磁响应的独特特性，来定位和控制二维层状材料中基于缺陷的单光子发射器（SPE）。我们表明，介电纳米天线能够诱导高达20以上的高珀塞尔增强，从而实现更亮的单光子发射，其特征在于发射器辐射寿命的缩短以及亮度增强超过一个数量级。我们证明，亚波长尺度的介电纳米天线还可以被设计成施加一个预定的应变分布，该应变分布决定了SPE的限制势，从而实现对光偏振的稳健控制，消光比高达94%。通过应变工程实现的大珀塞尔增强、偏振取向和位点控制的结合，展示了介电纳米天线在增强用于量子信息技术的二维SPE的量子光学性质方面的优势和独特能力。
