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Design, Fabrication, and Experimental Characterization of Plasmonic Photoconductive Terahertz Emitters

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Terahertz line detection by a microlens array coupled photoconductive antenna array.

B Pradarutti¹, R Müller, W Freese

¹Fraunhofer Institute for Applied Optics and Precision Engineering IOF, Jena, Germany. boris.pradarutti@iof.fraunhofer.de

|October 30, 2008

Summary

This summary is machine-generated.

We developed a 16-antenna array for terahertz (THz) ultrashort pulse detection. Using a microlens array for efficient excitation significantly boosts detection efficiency compared to line focus methods.

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Area of Science:

Optoelectronics
Micro-optics
Terahertz (THz) technology

Background:

Photoconductive antennas are crucial for detecting ultrashort pulses.
Efficient excitation is key to improving detector performance.
Current methods may lack optimal spatial focusing for excitation.

Purpose of the Study:

To enhance the detection efficiency of THz ultrashort pulses.
To investigate the use of a microlens array for improved photoconductive antenna excitation.
To compare the performance of a microlens array excitation with traditional line focus methods.

Main Methods:

Utilized a 16-element photoconductive antenna array.
Employed a microlens array to generate 16 focused spots from a femtosecond laser beam for excitation.
Measured THz pulse detection efficiency.

Main Results:

Achieved efficient excitation of the photoconductive antenna array using the microlens array.
Demonstrated an order of magnitude improvement in detection efficiency.
Confirmed the superiority of the focused spot excitation over line focus.

Conclusions:

The combination of photoconductive antenna arrays and microlens arrays offers a significant advancement in THz detection.
Microlens array-based excitation provides a highly efficient method for THz ultrashort pulse detection.
This approach enhances optoelectronic and micro-optic integration for improved performance.