Pulse terahertz time-domain spectral system with single photoconductive antenna and detection method thereof

Abstract

The invention belongs to the technical field of terahertz time-domain spectrums and provides a pulse terahertz time-domain spectral system with single photoconductive antenna and a detection method thereof. A terahertz emitter and a detector in an existing terahertz time-domain spectral system are spatially separated, thus system size is large, the cost is high, the structure is complex and carrying is inconvenient. Femtosecond laser is divided into pumped light and detecting light; the detecting light combines with the pumped light after passing by an optical delay line and then enters the photoconductive antenna; pumped light pulses and detecting light pulses arrive at the photoconductive antenna at different time; the pumped light pulses have bias voltage when arriving at the photoconductive antenna, and meanwhile, the photoconductive antenna is used as the terahertz emitter, emitting terahertz pulses; the detecting light pulses have no bias voltage when arriving at the photoconductive antenna, and meanwhile, the photoconductive antenna serves as a terahertz detector, detecting terahertz pulses. Therefore, emission and detection of the terahertz can be finished with only the photoconductive antenna, and the terahertz emitter and the terahertz detector are spatially integrated.

Description

technical field [0001] The invention belongs to the technical field of terahertz time-domain spectroscopy, and relates to a pulsed terahertz time-domain spectroscopy system and detection method of a single photoconductive antenna, which can realize the spatial integration of a terahertz transmitter and a detector. Background technique [0002] Terahertz wave is a general term for electromagnetic waves of a specific band. The so-called terahertz band generally refers to a frequency range of 0.1THz to 10THz, which is between millimeter waves and infrared in the electromagnetic spectrum. Terahertz waves are in a special position in the transition from electronics to photonics in the electromagnetic spectrum, and have unique properties such as perspective, safety, and spectral resolution, so they have very important research value and application prospects. Terahertz spectroscopy and imaging technology has shown great application potential in many fields such as biology, medical...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to propose a pulsed terahertz time-domain spectroscopy system and detection method with a single photoconductive antenna, which can realize the integration of terahertz emitters and detectors in space, and solve the problem that the existing terahertz time-domain spectroscopy system has a large volume and High cost, complicated structure, inconvenient to carry, etc.

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