A5023917791- Advanced Optical Sensing Technologies
- Photonic and Optical Devices
- Microwave Engineering and Waveguides
- Superconducting and THz Device Technology
- Radio Frequency Integrated Circuit Design
- Astrophysics and Star Formation Studies
- Ocular and Laser Science Research
- Integrated Circuits and Semiconductor Failure Analysis
- Molecular Spectroscopy and Structure
- CCD and CMOS Imaging Sensors
- Spectroscopy and Laser Applications
- Gyrotron and Vacuum Electronics Research
- Laser Design and Applications
- Real-time simulation and control systems
- Calibration and Measurement Techniques
- Semiconductor Lasers and Optical Devices
- Stellar, planetary, and galactic studies
- Advanced Thermodynamic Systems and Engines
- Electric and Hybrid Vehicle Technologies
- Advanced Semiconductor Detectors and Materials
- Radiation Detection and Scintillator Technologies
- Engineering Applied Research
- Optical Systems and Laser Technology
- Advanced Fluorescence Microscopy Techniques
Institute of Astronomy and Astrophysics, Academia Sinica
2018-2024
National Taiwan University
2023-2024
National Taiwan University of Science and Technology
2024
National Central University
2021-2022
Abstract We report on the development and commissioning of a new Q-band receiver for Nobeyama 45 m telescope, covering 30–50 GHz with noise temperature about 15 K. name it eQ (extended Q-band) receiver. The system temperatures observations are measured to be ∼30 K at 33 ∼75 GHz. half-power beam-width (HPBW) is around 38${^{\prime \prime }}$ 43 To enhance observation capability, we tested smoothed bandpass calibration technique demonstrated that time can significantly reduced compared...
The idea of ALMA Band-4+5 receivers are proposed for the upgrade after 2030. new receiver will cover RF frequency original Band-4 and Band-5 with continuous tuning over 125 –211 GHz dual polarizations, sidebands capability. instantaneous intermediate (IF) bandwidth is up to 16 per sideband polarization. Both SIS-based HEMT-based schemes considered. For SIS scheme, niobium-based junctions be fabricated form mixer chips, integrated into blocks broadband waveguide 3-dB quadrature hybrid...
We carry out an In <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">0.53</sub> Ga xmlns:xlink="http://www.w3.org/1999/xlink">0.47</sub> As/In xmlns:xlink="http://www.w3.org/1999/xlink">0.52</sub> Al xmlns:xlink="http://www.w3.org/1999/xlink">0.48</sub> As single photon avalanche diode which exhibits a detection efficiency exceeding 60% at 1310 nm and neat temporal characteristic of 65 ps. A novel concept dual multiplication layer is incorporated...
A larger than 50% fractional bandwidth cryogenic orthomode transducer (OMT) based on turnstile junction is designed and fabricated. The OMT has one circular waveguide of 7.2 mm diameter input port two standard WR-22 output ports. At room temperature, it exhibits better 18 dB return losses across 29 to 50 GHz with 0.5 1.5 insertion loss. Cross-polarization isolation are 38 dB. performance the further tested under condition for radio astronomical receiver application. measured loss 2.0 while...
We report on the development and commissioning of a new Q-band receiver for Nobeyama 45-m telescope, covering 30--50 GHz with noise temperature about 15 K. name it eQ (extended Q-band) receiver. The system temperatures observations are measured to be $\sim$ 30 K at 33 75 45 GHz. Half-Power-Beam-Width (HPBW) is around 38\arcsec 43 To enhance observation capability, we tested smoothed bandpass calibration technique demonstrated time can significantly reduced compared standard position switch...
We have conducted Q-band (30 GHz $-$ 50 GHz) line survey observations toward a carbon-chain emission peak in the Serpens South cluster-forming region with extended (eQ) receiver installed on Nobeyama 45 m radio telescope. Approximately 180 lines been detected including tentative detection, and these are attributed to 52 molecules isotopologues. It has found that this position is rich species as much Cyanopolyyne Peak Taurus Molecular Cloud-1 (TMC-1 CP), suggesting chemical youth. Not only...
Abstract We have conducted Q-band (30–50 GHz) line survey observations toward a carbon-chain emission peak in the Serpens South cluster-forming region with extended (eQ) receiver installed on Nobeyama 45 m radio telescope. Approximately 180 lines been detected, including tentative detection, and these are attributed to 52 molecules isotopologues. It has found that this position is rich species as much Cyanopolyyne Peak Taurus Molecular Cloud-1 (TMC-1 CP), suggesting chemical youth. Not only...
The Atacama Large Millimeter/submillimeter Array (ALMA) Band 1 receiver covers the frequency range of 35-50 GHz. An extension up to 52 GHz is on a best-effort basis. A total 73 units have be built in two phases: 8 preproduction and then 65 production units. This paper reports assembly, testing, performance receiver. infrastructure, integration, evaluation fully-assembled system will covered. Finally, discussion technical managerial challenges encountered for this large number receivers presented.
Abstract A high image rejection 38 GHz demodulator in TSMC 65-nm CMOS process is presented. To achieve better than −40 dBc ratio (IRR), a low I/Q mismatch 45° LO power splitter of sub-harmonic mixer proposed. In this design, the composed Wilkinson divider, series delay line with electrical length on one side and shunt 90° transmission other side. This configuration attractive because its design simplicity easy fabrication. Compared conventional techniques that utilize capacitors inductors...
The Atacama large millimeter/submillimeter array (ALMA) band-1 receiver covers the frequency band between 35-50 GHz. An extension of up to 52 GHz is on a best-effort basis. Covering longest wavelengths visible with ALMA, this enabling studies dust grain evolution in proto-planetary systems probing sizes close 1 cm, and multiple red-shifted molecular lines it will open new window high-redshift universe. project has recently achieved first light passed major milestone. We present challenges,...
A W-band quadrature hybrid couplers to achieve extended is investigated, design, fabricated and measured. The goal the passband beyond standard 75-110 GHz passband, with amplitude imbalance less than 1.0dB. simulated results indicate that for $12^{\mathbf{th}}$- order hybrid, design of +− 1.0 dB can be achieved 73 – 115 measured shows 1-dB 74 116 GHz. phase error from 90 degree 2 degrees over 67
We have demonstrated a photon-number resolving detector based on high efficiency InGaAs/InAlAs single photon avalanche diode (SPAD). To our knowledge, it is the first time that inherently performed by SPAD.
The performance of InGaAs/InAlAs single photon avalanche diodes (SPAD) was improved with fabrication in triple mesa. Current SPADs achieve better dark count rate 5 × 104 ⁄2 for detection efficiency 31% at RT.