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Tanaka S.,Advanced ICT Research Institute
Journal of the National Institute of Information and Communications Technology | Year: 2013

By technical progress of nanotechnology and biotechnology in recent years, the target of research is coming to the similar, nano-molecular complexes, and that the idea to use the function of a bio-system substance for bottom up process in nanotechnology has been emerged. Such concepts are promising to produce novel functions of organic materials. In this paper, we introduce the research of nano-scale construction using DNA tiling technology, which is one of the typical examples of bottom up construction with bio-materials. Source


Yamashita T.,Advanced ICT Research Institute
Journal of the National Institute of Information and Communications Technology | Year: 2013

Recently, in the various fields such as quantum communication, superconducting nanowire single-photon detectors (SSPD) attract much attention because of their many merits, e.g., high counting rate and so on. However, several parts of important fundamental physics in SSPDs has not been clarified yet. In this work, we measured and analyzed the dark count (error count) of the SSPD in a wide temperature range, and identified its physical origin. Source


Miki S.,Advanced ICT Research Institute
Journal of the National Institute of Information and Communications Technology | Year: 2013

In the field of various kinds of applications, photon detection technology is one of the key technologies and there is a strong demand to improve detector's performances. Superconducting nanowire single photon detector (SSPD) is expected as a promising candidate to achieve excellent performances (high detection efficiency, fast response speed, short timing jitter, and low dark count rate) as compared to semiconductor avalanche photo diode which is mostly used at present. In this paper, we introduce the mechanism and features of SSPD and report on the development of multichannel SSPD system. Source


Wang L.,Shanxi University | Tamaki R.,University of Electro - Communications | Kasai K.,Advanced ICT Research Institute | Okada-Shudo Y.,University of Electro - Communications | And 2 more authors.
Laser Physics Letters | Year: 2015

We present a convenient method to generate high quality single-frequency green light at a wavelength of 540 nm. It consists of a noise suppressed external cavity diode laser at a wavelength of 1080 nm by optical filtering and resonant optical feedback, and a frequency doubling of the fundamental light with an a-cut KTP crystal. Highly efficient conversion is realized by type II non-critical phase matching. A stable single-frequency operation with a maximum power of about 20 mW is performed for more than 3 h. Both the intensity noise and line-width reach the level of a monolithic nonplanar ring laser, which is well known for its extraordinarily narrow line-width and extremely low noise among available single-frequency operating lasers. © 2015 Astro Ltd. Source


Inoue S.-I.,Advanced ICT Research Institute | Otomo A.,Advanced ICT Research Institute
Journal of the National Institute of Information and Communications Technology | Year: 2013

We report the fabrication and device applications of the nonlinear photonic crystals (PhCs) which combines PhC functions for controlling the light dispersion characteristics and highly nonlinear optical organic materials. We reveal a direct relationship between the observed nonlinear optical responses and the corresponding photonic band dispersion nature such as a slow light in the nonlinear PhCs, and we show experimental evidence that the performance of nonlinear optical applications such as the optical switch, wavelength conversion and two-photon absorption devices are dramatically improved in this structure. Moreover, we report on the design and experimental demonstration of an integrated Mach-Zehnder electro-optic (EO) modulator based on the silicon PhC waveguides combined with an EO polymer exhibiting large electro-optic properties. Source

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