标题：Superconducting Devices: Hot Electron bolometers and Single Photon Detectors

报告人：Prof. Gregory Goltsman（莫斯科国立师范大学）

摘要：We present our recent achievements in the development of sensitive and ultrafast thin-film superconducting sensors: hot-electron bolometers (HEB), HEB-mixers for terahertz range and infrared superconducting single-photon detectors (SSPD). These sensors have already demonstrated a performance that makes them devices-of-choice for many terahertz and optical applications. HEB mixers based on ultrathin films of NbN combine the best sensitivity at the frequencies well above 1 THz and a gain bandwidth of about 4-5 GHz, which make them suitable for most sensitive instruments. Direct detectors made from NbN films are operated in 0.3-10 THz range exhibit response time as low as 50 ps with noise equivalent power (NEP) of 3´10^-13 W Hz^-1/2. A promising type of the IR photon counting detector is superconducting single-photon detector (SSPD). In addition to the chip SNSPD with normal incidence coupling, we use the detectors with a travelling wave geometry design. In this case a NbN nanowire is placed on the top of a Si₃N₄ nanophotonic waveguide, thus increasing the efficient interaction length. Our approach is fully scalable and, along with a large number of devices integrated on a single chip, can be adapted to the mid IR range where photon-counting measurement may be beneficial as well.

报告时间：2026年10月15日（星期四）10:00 

报告地点：紫金山天文台仙林园区5栋216会议室

欢迎大家参加！