Yasuhiko Abe

Fabrication of Slot-Antenna Coupled Warm Carrier Detectors for Submillimeter Wave Radiation

Thin-film slot-antenna-coupled edge-type warm carrier devices with a contact area of about 8×10-10 cm2 were fabricated, and their detection properties were investigated at 700 GHz. The fabricated slot antenna operates as a one-wavelength slot antenna as designed on the basis of the experimental results obtained in the microwave region. In addition, the fabricated edge-type warm carrier device operates as a detector, and rectifies the 700 GHz signal received by the antenna. The sensitivity of the device at 700 GHz was about 100 V/W.

Thin-Film Slot Antennas for 2.5 THz Submillimeter Radiation

Thin-film slot antennas for 2.5 THz submillimeter radiation were fabricated by the photolithographic method on a fused quartz substrate. The antenna properties were investigated by measuring the antenna patterns for 2.5 THz CH3OH laser radiation. It was found that the fabricated antennas work as receiving antennas at 2.5 THz. The measured antenna patterns agreed with the theoretical antenna patterns in free space despite the dielectric substrate.

Fabrication of the thin film slot antenna arrays for receiving 28 THz-CO2 laser radiation

Thin film parasitic slot antenna arrays with 0.1-μm-width DC cuts were fabricated using a microfabrication technique, and the receiving properties were investigated at 28 THz in order to expand the operating frequency and to improve the power gain. The experimental results indicate that the fabricated antenna arrays operate as expected from the theory based on the transmission line model, and the power gain improved by 6 dB compared to the single slot antenna when fabricating the 7-parasitic slot antenna array.

Image Sensing Technology. Antenna-Coupled Microbolometer Array for Far-Infrared Laser Detection.

One- and two-dimensional slot antenna-coupled microbolometer arrays were fabricated, and the receiving properties for 2.5-THz CH3OH-laser radiation were measured. The pattern of the fabricated arrays coincided with those of a single-slot antenna-coupled microbolometer, independent of the array number. The detected voltage increased linearly with the number of slots, and the optimum distance between slots was found to be 0.5 λd (λd is the dielectric wavelength.) in the E-plane and 1.6 λd in the H-plane.