The THz Emission Properties of Small-Aperture Photoconductive Antenna

Zhen, 黄振 Huang; Bin, 于斌 Yu; Guozhong, 赵国忠 Zhao

doi:10.3788/cjl20103701.0110

Cited by 4 publications

(2 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…It is evident that the camparison of the signal from the two branches of the spectrometer are consistent. We use the fast Fourier transform of the data measured by the system and the equation (4) to calculate the sapphire birefringence, as shown in Fig. 4.…”

Section: Measurement Results and Discussionmentioning

confidence: 99%

“…With the rapid development of terahertz radiation generation and detection technology, terahertz time-domain spectroscopy(THz-TDS) technique has steadily and gradually matured over the last 30 years [1]. For example，terahertz emitters [2][3][4]and detectors [5][6] have improved significantly as a result of recent advances in semiconductor fabrication. Until recently, polarized-dependent terahertz spectroscopy has attracted the interest of researchers due to the importance of the anisotropic dielectric properties of materials in chemical, physical and biochemical fields.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Dual polarization THz time domain spectroscopy system

Zhao

Savini

et al. 2017

2017 10th UK-Europe-China Workshop on Millimetre Waves and Terahertz Technologies (UCMMT)

View full text Add to dashboard Cite

In many THz Time Domain Spectroscopy configurations, the separate acquisition of background and sample measurements have significant impact on data quality due to the need to perform subsequent measurements as well as the change in beam coupling geometry due to the removal of the sample in the reference measurement. In this short paper, we report on the design and build of a dual-polarization TDS system to perform synchronous background/sample measurements. This is achieved through the splitting of the PCA-generated THz beam with a THz polarizer to obtain two orthogonal polarized beams which are balanced and modulate the indices of two separate crystals on which the probe beam (also split) is reflected off before being detected. The two branches of the system show good similarity, and can be used to perform background and sample measurements synchronously, thus not being affected by changes in temperature and humidity, as well as small fluctuations in source power. Small differences in detector optical efficiency can be calibrated out at the start of a measurement session.

show abstract

Section: Measurement Results and Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Dual polarization THz time domain spectroscopy system

Zhao

Savini

et al. 2017

2017 10th UK-Europe-China Workshop on Millimetre Waves and Terahertz Technologies (UCMMT)

View full text Add to dashboard Cite

show abstract

A dual-port THz Time Domain Spectroscopy System optimized for recovery of a sample’s Jones matrix

Zhao

Savini

et al. 2019

Sci Rep

View full text Add to dashboard Cite

We describe the design, build and characterization of a novel two-output port configuration for a THz-Time Domain Spectroscopy (TDS) system. By introducing a tilted THz ultra-broadband polarizer, we split the THz beam in two orthogonal polarization detector branches. The probe laser is similarly split (with an optical polarizer) replicating the detection chain to obtain two independent orthogonal polarization detection units. We describe the system’s performance highlighting some of the advantages of this system in one of its two modes of operation: optimized polarimetry for Jones matrix measurements. A bi-refringent sapphire standard was measured to confirm its capabilities and assess the performance of the system showing good agreement with existing literature data.

show abstract

Baseline offset correction technique for terahertz signals based on improved wavelet multiresolution analysis

Xiong,

Jiang,

Huang

et al. 2024

Phys. Scr.

View full text Add to dashboard Cite

During the terahertz nondestructive testing of bonded structures, the incomplete discharge of the capacitance in the photoconductive antenna within the terahertz time-domain spectroscopy system results in a shift of the terahertz baseline produced by the antenna. This baseline shift causes variations in the amplitude information of the detected signals.Consequently, when feature imaging of the detection waveforms is performed, the baseline shift can lead to erroneous detection results. In this study, an improved wavelet multiresolution analysis method was used to eliminate high-frequency noise and baseline offset in terahertz detection. The method is based on the frequency characteristics of the detection waveforms, setting thresholds and using similarity as a measurement standard to determine the number of decomposition layers. Ultimately, this achieves the correction of the baseline offset in terahertz signals. Compared with other baseline correction methods, the method presented in this paper achieves the lowest root mean square error of 0.57%, the highest signal-to-noise ratio of 12.64%, and a defect identification accuracy of 96.27% in two-dimensional visualization results.

show abstract

The THz Emission Properties of Small-Aperture Photoconductive Antenna

Cited by 4 publications

References 0 publications

Dual polarization THz time domain spectroscopy system

Dual polarization THz time domain spectroscopy system

A dual-port THz Time Domain Spectroscopy System optimized for recovery of a sample’s Jones matrix

Baseline offset correction technique for terahertz signals based on improved wavelet multiresolution analysis

Contact Info

Product

Resources

About