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Novel fabrication technologies of planar nano-gap electrodesfor single molecule evaluation
Ken Tsutsui,Masashi Nakata,Masayuki Morita,Masahide Tokuda,Kazuyuki Nagatsuma,Harumasa Onozato,Tadao Kaneko,Tomohiko Edura,Yoshio Mita,고이누마히데오미,Yasuo Wada 한국물리학회 2007 Current Applied Physics Vol.7 No.4
Present information technologies use semiconductor devices and magnetic/optical disc. However, they are all foreseen to face funda-mental limitations within a decade. Therefore, superseding devices are required for the next paradigm of high performance informationare expected as the most probable candidate to supersede the present semiconductor devices. The rst milestone towards the realizationof single molecule devices in future electronics requires quantitative evaluation of single molecule characteristics, which inevitably needsplanar nano-gap electrodes between which single molecules are sandwiched, observed their structures and measured their electrical char-acteristics. Nano-meter electrode pattern fabrication was achieved by electron beam lithography and metal lift-o, while planarizationprocessing technologies are described in this paper to realize nm-planar nano-scale electrodes.
Generation of Coherent Sub-Terahertz Carrier with Phase Stabilization for Wireless Communications
Yoshimizu, Yasuyuki,Hisatake, Shintaro,Kuwano, Shigeru,Terada, Jun,Yoshimoto, Naoto,Nagatsuma, Tadao The Korea Institute of Information and Commucation 2013 Journal of communications and networks Vol.15 No.6
In this paper, we present a photonic approach for generating highly stable coherent sub-terahertz (THz) signals for wireless communications. As proof-of-concept we transmit data at 100 GHz carrier frequency using on-off keying modulation and heterodyne detection. The sub-THz carrier signals are generated by photo-mixing two optical carrier signals at different frequencies, extracted from an optical frequency comb. We introduce a novel system to stabilize the phase of the optical carrier signals. Error-free transmission is successfully achieved up to a bit rate of 8.5 Gbit/s at 100 GHz.
Generation of Coherent Sub-Terahertz Carrier with Phase Stabilization for Wireless Communications
Yasuyuki Yoshimizu,Shintaro Hisatake,Shigeru Kuwano,Jun Terada,Naoto Yoshimoto,Tadao Nagatsuma 한국통신학회 2013 Journal of communications and networks Vol.15 No.6
In this paper, we present a photonic approach forgenerating highly stable coherent sub-terahertz (THz) signals forwireless communications. As proof-of-concept we transmit data at100 GHz carrier frequency using on-off keying modulation andheterodyne detection. The sub-THz carrier signals are generatedby photo-mixing two optical carrier signals at different frequencies,extracted from an optical frequency comb. We introducea novel system to stabilize the phase of the optical carrier signals. Error-free transmission is successfully achieved up to a bitrate of 8.5 Gbit/s at 100 GHz.
Wireless Communication at 310 GHz Using GaAs High-Electron-Mobility Transistors for Detection
Stéphane Blin,Lucie Tohme,Dominique Coquillat,Shogo Horiguchi,Yusuke Minamikata,Shintaro Hisatake,Philippe Nouvel,Thomas Cohen,Annick Pénarier,Fabrice Cano,Luca Varani,Wojciech Knap,Tadao Nagatsuma 한국통신학회 2013 Journal of communications and networks Vol.15 No.6
We report on the first error-free terahertz (THz) wirelesscommunication at 0.310 THz for data rates up to 8.2 Gbps using a18-GHz-bandwidth GaAs/AlGaAs field-effect transistor as a detector. This result demonstrates that low-cost commercially-availableplasma-wave transistors whose cut-off frequency is far below THzfrequencies can be employed in THz communication. Wirelesscommunication over 50 cm is presented at 1.4 Gbps using a unitravelling-carrier photodiode as a source. Transistor integration isdetailed, as it is essential to avoid any deleterious signals that wouldprevent successful communication. We observed an improvementof the bit error rate with increasing input THz power, followed bya degradation at high input power. Such a degradation appearsat lower powers if the photodiode bias is smaller. Higher-dataratecommunication is demonstrated using a frequency-multipliedsource thanks to higher output power. Bit-error-ratemeasurementsat data rates up to 10 Gbps are performed for different inputTHz powers. As expected, bit error rates degrade as data rate increases. However, degraded communication is observed at somespecific data rates. This effect is probably due to deleterious cavityeffects and/or impedance mismatches. Using such a system, realtimeuncompressed high-definition video signal is successfully androbustly transmitted.