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Terahertz (THz) near-field detection of liquid was demonstrated by using a scanning laser THz imaging system. The obtained data indicate sample specific peaks and the technique has a potential for evaluating small amounts of liquid.
A flexible terahertz (THz)-time domain spectroscopy (TDS) system has been fabricated by using air guided photonic crystal fibers for 1.56 μm laser and a DAST crystal as an emitter. Using this system we could obtain reliable refractive index value n of Si in the frequency ranges from 0.2–2.8 THz.
We evaluatetd a GaAs<110> substrate as a two-dimensional (2D) terahertz (THz) emitter by using a recent-fabricated scanning laser terahertz imaging system. As a result, we could observe a certain THz radiation available to a 2D THz emitter plate.
We have developed a scanning laser terahertz imaging system with 1.56 μm femtosecond fiber laser for high-speed and high resolution measurement. Using this system, we succeeded in obtaining high-resolution THz images of various samples. An imaging speed of about 47 seconds/image for 512 × 512 pixels and a spatial resolution of up to 56 μm were achieved.
Metamaterial active in the terahertz (THz) frequency region is very attractive due to its potential for building unique optical components, such as superlenses, using relative simple fabrication technique. The meta-atom, an elementary unit of the metamaterial, is an electromagnetic resonator with non-zero magnetic and/or electric dipole interacting with free space electromagnetic wave. All present...
Visualization of the dynamics of the electromagnetic resonators used to build metamaterial is presented. Observed data provides detailed information on the interaction between free space radiation and the resonator.
We constructed a laser scanning terahertz (THz) imaging system for high-speed imaging by using a galvano scanner and an organic nonlinear optical crystal, DASC, as a two-dimensional THz emitter. Using this system, we succeeded in obtaining high-resolution THz images of a test sample.
Terahertz (THz) emission property of Fe-implanted InP photoconductive antenna (PCA) has been studied by 1.56 μm wavelength laser excitation. The obtained experimental data by THz time-domain spectroscopy measurements show the possibility of two-photon excitation in the THz emission process.
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