Dissertation > Excellent graduate degree dissertation topics show

Study on NbN Hot Electron Bolometer Mixer

Author: ZuoLin
Tutor: HeJian
School: Huazhong University of Science and Technology
Course: Optical Engineering
Keywords: Niobium nitride Hot electrons Photomixer Noise temperature
CLC: TN773
Type: Master's thesis
Year: 2011
Downloads: 19
Quote: 0
Read: Download Dissertation

Abstract


HEB mixer based terahertz detectors in astronomy , has experienced 20 years of continuous development . HEB is a planar waveguide which has minimal parasitic reactances . Successfully deployed in the Antarctic in 2003 TREND spectrometer is based on HEB technology made ??. Superconducting material heterodyne terahertz wave detector based on the niobium nitride (NbN) has an extremely high sensitivity, its bilateral band noise temperature can be close to the quantum limit of magnitude . Faint submillimeter this detector can be used to cosmic radiation , terahertz wave reception and analysis , has a very significant meaning for the study of cosmic radiation . Detector heterodyne optical mixing technology, a process called HEB and HEB mixer cooling type (p-HEB) and electron diffusion cooling type ( d - HEB ) can be divided into the electron - phonon interaction . In practical applications , the length of the micro-bridge for the d-HEB very short ( the electron diffusion time is less than the electron -phonon interaction time ) , the generated Josephson lot of noise , can be completely annihilation signal currents , it is only p-HEB before is feasible , we have here is the study of the former. The nature of its noise temperature , conversion gain , IV curves , size effect , stability , IF characteristics also not a good theory can fully explain . Now the most commonly used model is the Hot-Spot Model, it can well meet the above characteristics , when the local oscillator frequency exceeds the energy gap frequencies above , because the hot structure is no longer regular modulation , the theoretical and experimental data large deviation , and becomes larger as the frequency increases . The focus of our research is to establish an effective theoretical model to explain the performance characteristics, such as the paper made ??to strengthen the Andreev reflection items , to a comprehensive agreement with the experimental data , and thus its composition of focal plane arrays theoretical prediction . Finally, we use terahertz time domain spectroscopy (TDS) and Fourier transform infrared spectrometer used in the NbN HEB mixer system Zitex filter transmittance spectroscopy .

Related Dissertations

  1. Research on Error Characteristic of Microminiature MEMS Gyroscope,V241.5
  2. The Circuit Research of Low Phase Noise, Low Dissipation, Integrated Digitally Controlled Crystal Oscillator,TN752
  3. Analysis and Design of a Terahertz Generation System by Photomixing Working at 1550 nm,O431.1
  4. Improvement of Solid State Cathodoluminescence Intensity and Research on Interfaces Structure,O462
  5. Kα ray ultrashort intense laser hot electrons conversion,O532.13
  6. Experimental Studies on Kα Radiation Produced by Hot Electrons during the Interaction of Ultra-short and Ultra-intense Laser Pulse with Plasmas,O561
  7. Temperature Effect on Neuron Membrane Ion Channels in a Noise Enviroment,Q421
  8. Development of Electron Magnetic Spectrometer and Measurement of Hot Electrons Temperature,TL817.5
  9. Experimental Studies on Hot Electron Generation and Transition Radiation in the Physics of Intense Field,O532.25
  10. Studying on Interaction of high intensity ultrashort pulse laser with solid-plasmas,TN249
  11. Research on Electronical Function and Noise Mechanism of Plasma-column Antenna,TN822
  12. Study on SSCL with Different Electron Accelerated Layers,O463.1
  13. Guide cone fast ignition basic physics research,TL61
  14. Hot Electron Acceleration in the Process of Ultra-intense and Ultra-short Laser Plasmas Interaction,O441
  15. A Noise Test-system for Cryogenic Low Noise Amplifiers,TH70
  16. The Research and Design of Phase Conjugation Mixer in Retro-directive Array,TN773
  17. Microwave frequency components and research,TN773
  18. Applied Research of AFE in High-voltage Inverter,TN773
  19. Research on Intelligent Fault Diagnosis and Its Application in Inverter,TN773
  20. The Research and Application of DSP and FPGA in High Voltage Frequency Conversion,TN773

CLC: > Industrial Technology > Radio electronics, telecommunications technology > Basic electronic circuits > Multiplier, divider,inverter > Inverter, mixer
© 2012 www.DissertationTopic.Net  Mobile