Progress Report Stuttgart

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Presentation transcript:

Progress Report Stuttgart Dezember Meeting 2018 Stuttgart

Measurement Setup = Source ZBD ZBD: 170 – 260 GHz 260 – 400 GHz Wire Grid = Source Mirror Optical Isolator Faraday (45°) Mirror Mirror Sample + Sample Holder ZBD ZBD: 170 – 260 GHz 260 – 400 GHz 325 – 500 GHz (new) Mirror

Effect of Optical Isolator Here are presented pure transmission spectra without any signal processing (sample holder inside, no sample mounted):  Introducing an optical isolator into the signal path reduces the standing waves significantly and underlines as origin of the waves the path between source and detector. Half wavelength of the oscillations is approx. 1.2 m, which also fits to this distance between source and detector.

Effect of Frequency Modulation Here are presented pure transmission spectra without any signal processing (sample holder inside, Sample 3, antennas not aligned with MW beam):  Standing waves can be almost fully suppressed by frequency modulation of the MW beam.  The following measurements are performed with 6 GHz FM, and little smoothing (Savitzky-Golay filtering) and no optical isolator.

Comparison of Different g; 350 GHz  Broad resonance at a frequency of approx. 330 GHz  Higher g-value seems to increase absorption. 350 GHz antenna

Comparison of Different w; 350 GHz  Resonance vanishes at w = 0 350 GHz antenna

Comparison of Different Steps; 350 GHz 350 GHz antenna

Resonances in Extended Range  Maybe a small resonance around 300 GHz. 210 GHz antenna

New Sample Holders Automized (Stepper Motor) Lock-in Amplification possible (Servo Motor) Better Reproducibility But still problems!

Problems with Unexpected Signals Sample Holder: Version 2 210 GHz Signal? Modulation: 6 GHz Isolator: no Sample: New single antennas 210 GHz & 510 GHz Unexpected Signals Sign of Resonance?

Problems with Unexpected Signals 210 GHz Sample Holder: Version 2 Modulation: 6 GHz Isolator: no Sample: New single antennas 210 GHz & 510 GHz Unexpected Signals still there. Not scaling whether an array or single antenna. Sign of Resonance? Scaling with amount of antennas

Problems with Unexpected Signals Sample Holder: Version 3 Modulation: 6 GHz Isolator: yes Sample: New single antennas 210 GHz Background improved. Unexpected Signals still there Sign of Resonance?

Ideas for Improving Background Signal Alignment of Center of the beam with rotation axis of the sample holder Lock-in Amplification (Servo Motor) Sample Holder material MW absorber (up to now Al) ???