Closed-cycle microscopy cryostat

我们申请了一个闭环磁光显微镜低温恒温器，具有以下关键特性。·具有低温兼容高数值孔径显微镜光学器件（NA > 0.8）的自由空间光学访问。·在三个（xyz）自由度中对物镜或样品进行纳米定位，分辨率优于10 nm，范围至少为5 mm。·DC-20 GHz范围内信号的微波接入。·闭环运行，独立于液氦。·基础温度低于6开尔文。·可变样品温度6-300 K。·磁场的矢量控制，在整个温度范围内的幅度至少为5/1/1 T。合并后的仪器将使我的实验室进行显微镜和电子自旋共振光谱的缺陷中心和有机分子在低温下，以及低温宽场磁力测量使用合奏的NV中心的钻石。我们打算将这一工具用于沿着三个相关科学方向的项目。·单分子磁共振：我们将采用缺陷中心和微加工微波谐振器来检测和成像单分子水平上的核和电子自旋。·研究缺陷中心及其光物质相互作用：我们将研究新的缺陷中心，以及新的激光协议，以光学初始化和读取它们的自旋。·宽场磁场测量：我们将在微尺度上对磁场进行成像，使用缺陷中心的集合作为成像传感器。磁成像将与其他小组合作，对纳米结构中的持续电流和2D材料中的磁性进行成像。

We apply for a closed-cycle magneto-optical microscopy cryostat, having the following key characteristics. • Free-space optical access with cryo-compatible high-numerical-aperture microscope optics (NA > 0.8) . • Nanopositioning of the objective or the sample in three (xyz) degrees of freedom with better than 10 nm resolution and at least 5 mm range. • Microwave access for signals in the DC-20 GHz range. • Closed-cycle operation, independence from liquid Helium. • Base temperature below 6 Kelvin. • Variable sample temperature 6-300 K. • Vector control of the magnetic field with a magnitude of at least 5/1/1 T across entire temperature range. The combined instrument will enable my laboratory to perform microscopy and electron spin resonance spectroscopy on defect centers and organic molecules at cryogenic temperature, as well as cryogenic widefield magnetometry using ensembles of NV centers in diamond. We intend to employ this instrument for projects along three related scientific directions. • Single-molecule magnetic resonance: we will employ defect centers and microfabricated microwave resonators to detect and image nuclear and electron spins on the single-molecule level. • Study of defect centers and their light-matter interaction: we will investigate novel defect centers, as well as novel laser protocols to optically initialize and read their spin. • Widefield magnetometry: we will image magnetic fields at the microscale, using an ensemble of defect centers as an imaging sensor. Magnetic imaging will be employed in collaboration with other groups to image persistent currents in nanostructures and magnetism in 2D materials.