The Rabi population oscillation of a single excitonic two-level system in an isolated InxGa1—xAs quantum dot was examined by quantum wave function interferometry in the time domain. The corresponding energy splitting was also confirmed in an energy-domain measurement. Two-pulse dipole interference on an excited excitonic state revealed a long-lived coherence of zero-dimensional excitonic states and demonstrated coherent population flopping under a strong optical field.

Rabi cycle

Rabi frequency

Oscillation (cell signaling)

10.1002/1521-396x(200204)190:2<485::aid-pssa485>3.0.co;2-4

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Citations (7)

Development of an efficient praseodymium-doped fiber amplifier

IEEE Journal of Quantum Electronics (1998)

Y. Nishida Makoto Yamada T. Kanamori Kenji Kobayashi Jiro Temmyo

This paper describes the development of an efficient praseodymium-doped fluoride fiber amplifier (PDFA) using newly developed PbF/sub 2/-InF/sub 3/-based fluoride single-mode fiber. First, the spectroscopic properties of Pr/sup 3+/ in PbF/sub 2/-InF/sub 3/-based and ZrF/sub 4/-based fluoride glass are compared and then the fabrication of high-NA PbF/sub 2/-InF/sub 3/-based fluoride single-mode fiber is presented. The gain coefficients obtained with the developed fiber are 0.36 dB/mW with a forward pumping scheme and 0.4 dB/mW with a bidirectional pumping scheme. We use this newly developed fiber to construct two types of an efficient PDFA module. We realized a 19-in rack size PDFA module with a master oscillator/power amplifier laser diode (MOPA-LD) and a plug-in type PDFA module with a wavelength-stabilized 1.017-/spl mu/m LD and describe their amplification characteristics.

Praseodymium

ZBLAN

10.1109/3.704316

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Citations (53)

Nitrogen doping in cuprous oxide films synthesized by radical oxidation at low temperature

Materials Letters (2012)

Zhigang Zang Atsushi Nakamura Jiro Temmyo

10.1016/j.matlet.2012.10.083

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Citations (176)

Multilayered Graphene from SiC Films via Pyrolysis in Vacuum

Japanese Journal of Applied Physics (2009)

Yasuhiro Ogawa Atsusi Nakamura Akira Tanaka Jiro Temmyo

We demonstrate multilayered graphene formation from SiC films via pyrolysis in vacuum, where the SiC films with micro-3C and amorphous crystal structures have been grown by hydrogen radical-enhanced chemical vapor deposition. The Raman spectra composed of D, G, and 2D bands indicates multilayered graphene formed by controlling the substrate temperature in the 1250 to 1600 °C range and the duration time. We found that criterion parameters of the multilayered graphene such that both the peak intensity ratio of D-band against G-band and full width at half maximum of G-band are mainly dominated by pyrolysis temperature and duration time in vacuum as well as crystallinity of SiC films used.

Ultra-high vacuum

10.1143/jjap.48.04c140

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Citations (11)

A study of high-energy radiation imaging device fabricated by using pin-CdTe diode processed by excimer laser

PROCEEDINGS OF THE ITE CONVENTION PROCEEDINGS OF THE 2003 ITE ANNUAL CONVENTION (2003)

Daisuke Sakashita Atsushi Nakamura Tōru Aoki Jiro Temmyo Yoshinori Hatanaka

Excimer

Cadmium telluride photovoltaics

High energy

10.11485/itetaikai.2003s.0.93.0

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Citations (0)

Solder bump height dependence of Josephson chip-to-card interconnection inductance using flip-chip bonding technique

Journal of Applied Physics (1983)

Jiro Temmyo K. Aoki H. Yoshikiyo Shigeyuki Tsurumi Yoshiaki Takeuchi

Inductance measurements of solder bump flip-chip interconnection for a Josephson chip bonding are carried out by employing direct-coupled two-junction interferometers. For detailed chip bonding design, interconnection inductances are studied experimentally, as functions of solder bump heights, niobium pad shapes with moat structures, and pad positions from the chip ground plane edge. It is found that the ground plane inductance contribution is dominant; the bump height dependence of the interconnection inductance is not a simple linear function, because ground plane image current is modulated by the existence of pads and the moat structure.

Wire bonding

Ground plane

Coplanar waveguide

10.1063/1.332757

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Citations (6)

Plug-in type 1.3-μm fiber amplifier module for rack-mounted shelves

IEEE Photonics Technology Letters (1997)

Y. Nishida Makoto Yamada Jiro Temmyo T. Kanamori Yasutake Ohishi

We have successfully developed a plug-in type PDFA module for rack mounted shelves which is assembled on a printed-board. In this module, we use a newly developed Pr/sup 3+/-doped high-NA PbF/sub 2//InF/sub 3/-based fluoride fiber and wavelength stabilized 1.017-/spl mu/m laser diodes (LDs). We have obtained a small-signal gain of 24 dB and a noise figure of 6.6 dB at 1.30 /spl mu/m with an LD drive current of 240 mA/spl times/2. We achieved an output power of 10 dBm with a signal input power of 0 dBm. The total power consumption of this module, including that of a Peltier cooler, was 3.5 W when the LD drive current was 240 mA/spl times/2.

10.1109/68.605512

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Citations (7)

Pressure-induced modulation of the confinement in self-organized quantum dots produced and detected by a near-field optical probe

Physica E Low-dimensional Systems and Nanostructures (2000)

Arturo Chavez-Pirson Jiro Temmyo Hiroaki Ando

10.1016/s1386-9477(99)00343-4

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Citations (10)

Dot-height dependence of Photoluminescence from ZnO quantum dots

Extended Abstracts of the 2020 International Conference on Solid State Devices and Materials (2007)

Akira Nakamura K. Okamatsu Takehiko Tawara Hideki Gotoh Jiro Temmyo

We report on the optical properties of ZnO nanodots and how they are influenced by the height of the dot configuration. The nanodots were grown on SiO2/Si substrates by remote-plasma enhanced metalorganic chemical vapor deposition (RPE-MOCVD). The dot configuration was regulated by controlling the growth time. The photoluminescence (PL) spectra of nanodots having average dot height of 2.5, 3.5, and 4.5 nm grown on SiO2/Si substrates were measured at 16 K. A blue shift in the excitonic emission was observed for shorter dots due to a larger quantum confinement effect. The fractional-dimensional space model was used to estimate a dimensionality of 2.35 for ZnO nano dots with an average dot height of 2.5 nm.

Nanodot

Blueshift

10.7567/ssdm.2007.f-2-2

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