A polarization-sensitive 4-contact detector for terahertz time-domain spectroscopy

Area of Science:

• Optics and Photonics
• Terahertz Spectroscopy
• Semiconductor Device Physics

Background:

• Terahertz time-domain spectroscopy (TD-THz-TDS) requires sensitive detectors.
• Controlling light polarization is crucial for advanced spectroscopic applications.
• Existing detectors may lack polarization sensitivity or optimal performance.

Purpose of the Study:

• To design, fabricate, and test a novel photoconductive detector sensitive to light polarization angle.
• To evaluate the detector's performance in terahertz time-domain spectroscopy.
• To provide a device for advanced THz-TDS applications requiring polarization control.

Main Methods:

• Computer modeling and simulation of detector design.
• Microfabrication of the photoconductive detector.
• Experimental testing and characterization of the detector's response.

Main Results:

• The fabricated detector demonstrated a linear angular response, consistent with theoretical predictions for an ideal device.
• Experimental results showed good agreement with the computer model.
• Frequency, angular, and crosstalk responses were analyzed.

Conclusions:

• The developed detector is effective for terahertz time-domain spectroscopy with polarization sensitivity.
• The device shows promise for applications requiring precise control over terahertz wave polarization.
• Further optimization may enhance performance characteristics.