Nitrogen-vacancy defect emission spectra in the vicinity of an adjustable silver mirror

单量子发射体与机械蚀刻线上传播的等离子体激元的耦合

Coupling of single quantum emitters to plasmons propagating on mechanically etched wires

我们证明了一个单一的氮空位中心在纳米金刚石的机械蚀刻银纳米线传播等离子体激元模式的耦合。通过原子力显微镜悬臂的尖端在单晶银纳米片上进行机械蚀刻，以产生具有预先设计长度的线。我们发现，单等离子体激元传播可以在这些线，从而使这些结构的量子信息处理的平台。

Deterministic integration of single nitrogen-vacancy centers into nanopatch antennas

Quantum emitters coupled to plasmonic nanoantennas produce single photons at unprecedentedly high rates in ambient conditions. This enhancement of quantum emitters' radiation rate is based on the existence of optical modes with highly sub-diffraction volumes supported by plasmonic gap nanoantennas. Nanoantennas with gap sizes on the order of few nanometers have been typically produced using various self-assembly or random assembly techniques. Yet, the difficulty of controllably fabricate nanoantennas with the smallest mode sizes coupled to pre-characterized single emitters until now has remain…

基于六方氮化硼-银纳米立方体混合体系的单光子发射器等离激元增强量子特性

Plasmon Enhanced Quantum Properties of Single Photon Emitters with Hybrid Hexagonal Boron Nitride Silver Nanocube Systems

针对六方氮化硼单光子发射器量子效率低的问题，构建其与银纳米立方体的混合纳米光子结构，实现了室温下超200%的等离激元增强，为量子光通信与计算应用提供了紧凑平台。

Excitation of surface plasmon polariton modes with multiple nitrogen vacancy centers in single nanodiamonds

Nitrogen-vacancy (NV) centers in diamonds are interesting due to their remarkable characteristics that are well suited to applications in quantum-information processing and magnetic field sensing, as well as representing stable fluorescent sources. Multiple NV centers in nanodiamonds (NDs) are especially useful as biological fluorophores due to their chemical neutrality, brightness and room-temperature photostability. Furthermore, NDs containing multiple NV centers also have potential in high-precision magnetic field and temperature sensing. Coupling NV centers to propagating surface plasmon p…

Fiber-tip endoscope for optical and microwave control

We present a robust, fiber based endoscope with a silver direct-laser-written (DLW) structure for radio frequency (RF) emission next to the optical fiber facet. Thereby, we are able to excite and probe a sample, such as nitrogen vacancy (NV) centers in diamond, with RF and optical signals simultaneously and specifically measure the fluorescence of the sample fully through the fiber. At our targeted frequency-range around 2.9 GHz the facet of the fiber-core is in the near-field of the RF-guiding silver-structure, which comes with the advantage of an optimal RF-intensity decreasing rapidly with …

On-chip excitation of single germanium-vacancies in nanodiamonds embedded in plasmonic waveguides

Monolithic integration of quantum emitters in nanoscale plasmonic circuitry requires low-loss plasmonic configurations capable of confining light well below the diffraction limit. We demonstrate on-chip remote excitation of nanodiamond-embedded single quantum emitters by plasmonic modes of dielectric ridges atop colloidal silver crystals. The nanodiamonds are produced to incorporate single germanium-vacancy (GeV) centers, providing bright, spectrally narrow and stable single-photon sources suitable for highly integrated circuits. Using electron-beam lithography with hydrogen silsesquioxane (HS…

A high-sensitivity fiber-coupled diamond magnetometer with surface coating

Nitrogen-vacancy quantum defects in diamond offer a promising platform for magnetometry because of their remarkable optical and spin properties. In this Letter, we present a high-sensitivity and wide-bandwidth fiber-based quantum magnetometer for practical applications. By coating the diamond surface with silver reflective film, both the fluorescence collection and excitation efficiency are enhanced. Additionally, tracking pulsed optically detected magnetic resonance spectrum allowed a magnetic field sensitivity of $35$ pT$/\sqrt{\rm{Hz}}$ and a bandwidth of $4.1$ KHz. Finally, this magnetomet…

Chip-compatible quantum plasmonic launcher

Integrated on-demand single-photon sources are critical for the implementation of photonic quantum information processing systems. To enable practical quantum photonic devices, the emission rates of solid-state quantum emitters need to be substantially enhanced and the emitted signal must be directly coupled to an on-chip circuitry. The photon emission rate speed-up is best achieved via coupling to plasmonic antennas, while on-chip integration can be easily obtained by directly coupling emitters to photonic waveguides. The realization of practical devices requires that both the emission speed-…

用于低温应用的光刻定位工程纳米金刚石的单光子发射

Single photon emission from lithographically-positioned engineered nanodiamonds for cryogenic applications

本研究提出一种混合材料平台，通过光刻定位纳米金刚石于金属反射器上，增强收集效率，实现低温下单光子发射表征，为晶圆级量子光子学奠定基础。

Principles and Techniques of the Quantum Diamond Microscope

We provide an overview of the experimental techniques, measurement modalities, and diverse applications of the Quantum Diamond Microscope (QDM). The QDM employs a dense layer of fluorescent nitrogen-vacancy (NV) color centers near the surface of a transparent diamond chip on which a sample of interest is placed. NV electronic spins are coherently probed with microwaves and optically initialized and read out to provide spatially resolved maps of local magnetic fields. NV fluorescence is measured simultaneously across the diamond surface, resulting in a wide-field, two-dimensional magnetic field…

A cavity-based optical antenna for color centers in diamond

An efficient atom-photon-interface is a key requirement for the integration of solid-state emitters such as color centers in diamond into quantum technology applications. Just like other solid state emitters, however, their emission into free space is severely limited due to the high refractive index of the bulk host crystal. In this work, we present a planar optical antenna based on two silver mirrors coated on a thin single crystal diamond membrane, forming a planar Fabry-Pérot cavity that improves the photon extraction from single tin vacancy (SnV) centers as well as their coupling to an ex…