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Photoconductive antenna (PCA) array based THz near-field imager incorporating Hadamard multiplexing method is developed in this work. By using a 2 × 2 dipole antenna array as the THz transmitter, the system signal-to-noise ratio (SNR) is demonstrated to be improved by a factor of 2 as the theory predicts. Additionally, a 2-D scanning of a metallic structure on a THz-transparent substrate (with a total...
Taking advantages of the high contrast of microwave imaging and high spatial resolution of ultrasound imaging, microwave-induced thermoacoustic imaging (TAI), a non-ionizing modality, has been studied for biomedical applications, such as breast cancer detection. Nowadays, although progress has been made, improvised explosive devices (IEDs) are still a major threat to public safety. In this simulation...
We construct a terahertz time-domain spectrometer (THz-TDS) system based on photoconductive antenna (PCA). A 800 nm Ti:sapphire femtosecond laser with 80 MHz repetition rate provides the pump and probe laser pulse, which has a 45 fs pulse width (as short as 15 fs is available) and as much as 400 mW power. Two commercial PCAs with 34 um and 6 um gap size are used as the emitter and receiver, respectively...
All-dielectric Terahertz waveguides based on hollow-core EMXT fiber are fabricated via THz rapid prototyping using polymer jetting technique. Several waveguides of identical cross-section and differing lengths are characterized by THz time-domain spectroscopy (THz-TDS) to extract the waveguide intrinsic propagation loss. Measurement results agree very well with simulation. This as an initial example...
Carbon nanotube films are characterized using Vector Network Analyzer (VNA) and Terahertz Time-Domain Spectroscopy (THz-TDS). Both transmission and reflection experiments are performed in order to measure the complex refractive index and the wave impedance. This method allows simultaneous extraction of both the permittivity and permeability without any assumptions. Experimental results are obtained...
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