A5006013704- Photonic and Optical Devices
- Quantum Information and Cryptography
- Mechanical and Optical Resonators
- Advanced Optical Sensing Technologies
- Advanced Fiber Laser Technologies
- Advanced Fluorescence Microscopy Techniques
- Plasmonic and Surface Plasmon Research
- Atomic and Subatomic Physics Research
- Semiconductor Lasers and Optical Devices
- Nanowire Synthesis and Applications
- Photonic Crystals and Applications
- Optical Network Technologies
- Neural Networks and Reservoir Computing
- Optical Coatings and Gratings
- Semiconductor Quantum Structures and Devices
- CCD and CMOS Imaging Sensors
- Spectroscopy and Laser Applications
- Random lasers and scattering media
- Advanced Photonic Communication Systems
- Medical Imaging Techniques and Applications
- Image Processing Techniques and Applications
- Integrated Energy Systems Optimization
- Advanced Biosensing Techniques and Applications
- Superconducting and THz Device Technology
- Optical Polarization and Ellipsometry
Tianjin University
2016-2025
Wuhan National Laboratory for Optoelectronics
2021-2023
Huazhong University of Science and Technology
2021-2023
Ministry of Education of the People's Republic of China
2015-2023
South China University of Technology
2022-2023
Shanghai University of Electric Power
2020
Chongqing University
2019
Beijing Institute of Optoelectronic Technology
2019
Vassar College
2015
Massachusetts Institute of Technology
2008-2015
Photonic integrated circuits (PICs) have emerged as a scalable platform for complex quantum technologies using photonic and atomic systems. A central goal has been to integrate photon-resolving detectors reduce optical losses, latency, wiring complexity associated with off-chip detectors. Superconducting nanowire single-photon (SNSPDs) are particularly attractive because of high detection efficiency, sub-50-ps timing jitter, nanosecond-scale reset time, sensitivity from the visible...
Superconducting nanowire single-photon detectors (SNSPDs) perform counting with exceptional sensitivity and time resolution at near-infrared wavelengths. State-of-the-art SNSPDs, based on 100 nm-wide, 4 to 5 nm thick NbN nanowires, are vulnerable constrictions, which significantly limit their yield. Also, becomes negligible beyond 2 μm wavelength, makes them unsuitable for mid-infrared applications. SNSPDs few-tens-of-nanometer-wide nanowires expected efficiently detect photons operate low...
Abstract The extremely low loss of silica fibers has enabled the telecommunication revolution, but single-mode fiber-optic communication systems have been driven to their capacity limits. As a means overcome this crunch, space-division multiplexing (SDM) using few-mode (FMF) proposed and demonstrated. In optical fibers, Rayleigh scattering serves as dominant mechanism for loss. However, date, role in FMFs remains elusive. Here we establish experimentally validate general model FMFs....
Superconducting nanowire single-photon detectors (SNSPDs) have become a mainstream photon-counting technology that has been used in various applications. So far, most multi-channel SNSPD systems, either reported literature or commercially available, are polarization sensitive, is, the system detection efficiency (SDE) of each channel is dependent on state to-be-detected photons. Here, we report an eight-channel with fractal superconducting working wavelength range 930-940 nm all feature low...
Optical nano-antennae have been integrated with semiconductor lasers to intensify light at the nanoscale and photodiodes enhance photocurrent. In quantum optics, plasmonic metal structures used nonclassical emission from single dots. Absorption detection of photons free space could also be enhanced by nanometallic antennae, but this has not previously demonstrated. Here, we use nano-optical transmission effects in a one-dimensional gold structure, combined optical cavity resonance, form...
Measuring the states of polarization (SoP) light is fundamentally important for applications ranging from communication, sensing, spectroscopy, imaging, to navigation. Superconducting nanowire single-photon detectors (SNSPDs) are ideal choice faint-light detection and measurements, but SNSPDs themselves cannot resolve SoP photons. Here, based on a fractal SNSPD, we demonstrate full-Stokes polarimetric measurement system that can measure arbitrary faint light. The measured SoPs in excellent...
The near-unity system detection efficiency (SDE) and excellent timing resolution of superconducting nanowire single-photon detectors (SNSPDs), combined with their other merits, have enabled many classical quantum photonic applications. However, the prevalent design based on meandering nanowires makes SDE dependent polarization states incident photons; for unpolarized light, major merit high would get compromised, which could be detrimental photon-starved Here, we create SNSPDs an arced...
Single-photon sources play a key role in photonic quantum technologies. Semiconductor dots can emit indistinguishable single photons under resonant excitation. However, the resonance fluorescence technique typically requires cross-polarization filtering, which causes loss of unpolarized dot emission by 50%. To solve this problem, we demonstrate method for generating with optically controlled polarization two laser pulses off-resonant neutral exciton states. This scheme is realized exciting...
We developed a fiber-coupled superconducting nanowire single-photon detector system in close-cycled cryocooler and achieved 24% 22% detection efficiencies at wavelengths of 1550 1315 nm, respectively. The maximum dark count rate was approximately 1000 counts/s.
Experimental restrictions imposed on the collection and detection of shortwave-infrared photons (SWIR) have impeded single molecule work a large class materials whose optical activity lies in SWIR. Here we report successful observation room-temperature nanocrystal photoluminescence at SWIR wavelengths using highly efficient multielement superconducting nanowire photon detector. We confirm that from lead sulfide nanocrystals is strongly antibunched, demonstrating feasibility performing...
On-chip polarization controllers are extremely important for various optical systems. In this paper, a compact and robust silicon-based on-chip controller is proposed demonstrated by integrating special converter phase shifters. The consists of 1×1 Mach–Zehnder interferometer with two polarization-dependent mode converters at the input/output ends. When light an arbitrary state (SOP) launched into chip, TE 0 TM modes simultaneously excited. extinction ratio (PER) difference / tuned...
We demonstrate high-quality distribution of 1.3 microm polarization-entangled photons generated from a fiber-coupled periodically poled KTiOPO(4) waveguide over 200 m fiber-optic cables. Time-multiplexed measurements with 19% efficient superconducting nanowire single-photon detector at the remote location show detected flux 5.8 pairs/s pump power 25 microW and an average two-photon quantum-interference visibility 97.7% without subtraction accidentals.
We demonstrate superconducting nanowire single-photon detectors (SNSPDs) based on a fractal design of the nanowires to reduce polarization sensitivity detection efficiency. patterned niobium titanium nitride thin films into Peano curves with linewidth 100 nm and integrated optical microcavities enhance their absorption. At base temperature 2.6 K, SNSPD exhibited polarization-maximum device efficiency 67% polarization-minimum 61% at wavelength 1550 nm. Therefore, sensitivity, defined as...
Precise distance metrology and measurements play an important role in many fields of scientific research industrial manufacture. Dual-comb laser ranging combines sub-wavelength precision, large non-ambiguity range, high update rate, making it the most promising candidate precise measurements. However, previous demonstrations dual-comb suffer from short working distances, limited by decoherence lasers interferometric schemes or low sensitivity photodetectors response to sparse echo photons....
We investigate the timing properties of single-photon-triggered vortex (or anti-vortex) crossing in a current-biased superconducting nanowire and find that time delays caused vortex-crossing process vary with transverse positions on where photons are absorbed. The position-dependent indicate induces jitter single-photon detector (SNSPD). magnitude this further depends various parameters, including polarization incident photon, bias current, width nanowire. This vortex-crossing-induced might...
Full-Stokes polarimetric imaging light detection and ranging (LiDAR) provides rich information about distance, materials, texture, surface orientations, profiles of objects, it is an important remote-sensing technology. One major challenge to reach a long distance efficiently collect detect the echo photons, as for long-range LiDAR, photons may become sparse. Here, we demonstrate full-Stokes working at eye-safe, telecommunication wavelength 1560 nm, that can range 4 km. The key enabling...
<title>Abstract</title> Skyrmions are topologically stable quasiparticles that have been investigated in a variety of branches modern physics including particle physics, quantum field theory, solid-state acoustics and condensed-matter physics. The recent exploration skyrmions classical optics exhibits the transformative potential photonic information technology. optical skyrmion with local topological textures is expected to profoundly reshape landscape technology yet its experimental...
Quantum emitters are a key component in photonic quantum technologies. Enhancing single-photon emission by engineering their environment is essential for improving overall efficiency information processing. However, this enhancement often limited the need ultraprecise emitter placement within conventional cavities. Inspired fascinating physics of moiré pattern, we propose multilayer crystal with robust isolated flatband. Theoretical analysis reveals that, nearly infinite density states,...
We show that the distributed electronic and geometric inhomogeneity of a superconducting nanowire induces timing jitter resulting single-photon detector this could be further exacerbated by localized constrictions. Due to inhomogeneity, photons absorbed at different locations generate hotspots “sense” local properties during electro-thermal evolutions thereby produce varying time delays. The constrictions limit bias current, slow down Joule-heating process, consequently increase average...
We demonstrate a fiber-coupled fractal superconducting nanowire single-photon detector (SNSPD) system with minimum polarization dependence of detection efficiency. Its efficiency (SDE) was maximized at the wavelength 1540 nm, which measured to be 91 ± 4%; furthermore, we observed second local maximum SDE 520 61 2%. This dual-band feature due enhancement optical absorptance by two longitudinal resonance modes micro-cavity. By using high in these bands, implemented hybrid LIDAR for imaging...
Abstract Cavity-length dependence of the property optically pumped GaN-based vertical-cavity surface-emitting lasers (VCSELs) with two dielectric distributed Bragg reflectors was investigated. The cavity lengths were well controlled by employing etching inductively coupled plasma and chemical mechanical polishing. It found that lasing characteristics including threshold, slope efficiency spontaneous emission coupling factor substantially improved reducing length. In comparison device a 400...