Detector Requirements for THz

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Detector Requirements forTHz

• Mark Surman

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• also
• Steven Jamison, University of Strathclyde
• Timing experiments / pump probe
• Breakout
• William Duncan, NIST
• Detectors for the Future
• First Study of Long Wavelength Light from
• Electron Storage Ring (SRS)

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Long Wavelength Light
1 cm-1 0.03 THz 0.1 meV
10000 mm
100 cm-1 3 THz 10 meV
100 mm
500 cm-1 15 THz 60 meV
20 mm
4000 cm-1 120 THz 500 meV
2.5 mm
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Security imaging
In Air!
Wet samples?
Can it be fooled? False skin?
microscopic imaging
How safe?
How sensitive ?
Science Vol. 297, 2 Aug. 2002.
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Thymine H-bonded crystalline material Measured
spectrum and DFT calculations
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What do we want?

• Smaller Imaging sub diffraction
• Faster Time Resolution
• (although not everyone) pump -
  probe How?
  
• New Sources and detectors

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Why?

• In-situ chemical processing
• imaging structured liquids
• Biology - THz effect on cells
• Is it safe?
• - Protein folding (ps ms)
• pico mili second time scales
• - Inducing reactions
• populating long-lived high vibrational levels
  of large amplitude
• is it dangerous?

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• Imaging

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..impossible to obtain a sub-micron spatial
resolution with the present T-ray generation and
detection technologies. X-C Zhang Physics
in Medicine and Biology, 47
(2002) 3667
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Gold stripes on silicon
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Note lock in technique. Studies of hydration
dynamics Aiming for 10 mm
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ERLp Parameters
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Experimental verification
R Shelby, D R Smith, S. Scultz, Science 292
(2001) 77
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Process Chemistry

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Reactions

• Ultra -High Gas Pressure
• Liquids ? Ordered systems
• Inducing Reactions
• populate High Amplitude Long Lifetime modes of
  enzymes

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Conclusion part 1

• Optimise detector to source
• experience far IR on SRS, BESSY 1

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Timing Experiments

• Steven Jamison