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We have carried out the passive measurement of cold objects down to liquid nitrogen temperature at 1.5–2.5 THz using a 4 K-cryocooled terahertz (THz) photoconductive detector. We measured output signals of THz radiation from five materials of a 2 mm-thick acrylic plate, a 0.1 mm-thick pure H2O, a 2 mm-thick high-resistivity silicon substrate, a #2010 black velvet coated plate, and a gold plate as...
We have demonstrated terahertz (THz) passive imaging of a cold object using a 4 K-cryocooled THz photoconductive detector with BLIP at around 1.5–2.5 THz. In our imaging system, we achieved a resolution of 240 µm, a background limited NEP of 7.7×10−15W/√Hz and a NETD of 11 mK. We have measured temperature dependence of THz intesity emitted from a sample with the emissivity of 0.99. The result shows...
Wafer-level hybrid copper/polymer bonding technology suitable for wafer-level 3D integration (called “thinning after bonding”) was developed. A damascene process is applied for fabricating copper pads. After chemical mechanical polishing (CMP), a globally flat bonding surface is obtained by co-planarization of copper and polymer during barrier CMP. The key to this co-planarization process is optimizing...
We explored an origin of the random error in intensity spectra measured with THz-TDS. The optical-delay scanning, variations in temperature and humidity, the intensity fluctuation of fs-laser, and the THz detectors of LT-GaAs PC antenna and ZnTe EO-crystal are not the predominant origin of the random error.
We have demonstrated a terahertz (THz) detector system which employs three terahertz photoconductive semiconductor detectors to realize a response to a wide frequency range of 0.8 to 4 THz and a mechanical 4 K GM refrigerator instead of a liquid helium container to perform practical and convenient use. Optical and electrical performance of the THz detector system was evaluated at an operation temperature...
Uncooled 1300-nm range 25-Gbps EA/DFB lasers that support cost-effective optical transmitter for 100-Gbps Ethernet has been realized. A wide temperature ranged 12-km transmission with over 9.6-dB dynamic extinction ratio was demonstrated.
Direct modulation at 40 Gb/s of a 1.3-mum InGaAlAs distributed feedback ridge waveguide laser is experimentally demonstrated. By combination of the high differential gain of an InGaAlAs multiquantum well active layer, a short cavity length of 100 mum, and a low-resistance notch-free grating, it achieves high bandwidth of 29 GHz and high-extinction ratio of 5 dB at 40-Gb/s modulation. Moreover, the...
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