Recent Topics (Update: December 6, 07)
l I received a commendation for distinguished lecturer this year at the 30th
LEOS Annual Meeting at Florida (07.10).
l I lectured at IEEE/LEOS DL Emeritus in Silicon Valley as an honorary
lecturer. I faced a barrage of questions, and my allotted time of 30 minutes
was exceeded. (07.10)
l Our group received a visit from Dr. Kim of the H. Lee group at the Korea
Institute of Science and Technology. We enjoyed his lecture on photonic crystal
lasers and furthered our friendship. (07.5)
l I visited MIT and Harvard University and gave a talk to the
Capasso/Loncar group at Harvard. (07.5)
l After attending the CLEO/QELS meeting in Baltimore, two researchers and I
visited the University of Illinois at Chicago and discussed our research with
Dr. K. Choquette. We talked about small PC lasers. (07.5)
l Mr. Hong, a doctoral student at the University of Sydney, visited our
group and gave an impressive lecture. (07.5)
l Our group won the 1st Yokohama National University invention prize for
valuable patents and intellectual properties. (07.4)
l The PECS (Photonic and Electromagnetic Crystal Structures) workshop was
held in Monterey. PECS is the only meeting at which experts in the field from
around the world gather in one place and their lectures are very valuable. (07.4)
l We clearly observed dispersion-compensated slow light generated by
photonic band engineering. (07.3)
l We achieved room temperature continuous operation in a photonic crystal
nanolaser by resonance excitation. It is possible to progress to wavelength
transformation. (07.2)
l The use of a nanolaser to detect the change in reflective index with
alloyed accumulation was demonstrated. (07.2)
l Our study on integration technology appeared in the first issue of Nature
Photonics. (06.12)
l Dr. A. I. Nosich from Ukrajina visited our group and discussed microdisk
lasers, photonic molecules, and small PC lasers. (06.12)
l We observed an extraordinary long wavelength chirp, 10 nm at the maximum,
on a photonic crystal nanolaser. (06.12)
l We succeeded in observing the transmission of images using a superlens. (06.12)
l The method of an invisible mantle that we presented at the OSA annual
meeting at Rochester appeared in Science. (06.10)
l Our view of the TE/TM wave on the AWG corresponded closely with the
operation of an independent polarized wave on a Si nanowire. (06.8)
l We demonstrated for the first time dispersion-compensated slow light
predicted by theory. (06.8)
l We observed wideband slow light generated by a chirped structure photonic
crystal coupler. (06.8)
l The photonic integration research led by our group was selected as a new
CREST project by the Japan Science and Technology Association. (06.7)
l The operation of compact wavelength demultiplexers with a superprism and
a superlens was observed practically. (06.8)
l The thesis of Dr. Nozaki of our group appeared on the cover of Applied
Physics Letters. The article was concerned with the smallest laser in history,
namely, the point-shift photonic crystal nanolaser. This is the second time
that Dr. Nozakis work has appeared on the cover of Applied Physics Letters. (06.6)
l Our thesis on Si photonics won the Best Paper Award of the IEICE
(Institute of Electronics, Information and Communication Engineers), as one of
ten among one thousand theses. (06.5)
l I was elected as a new lecturer of IEEE/LEOS. Over the next year, I will
present the results of our study. (06.4)
l Our group published the third research review from 2003 to 2005. We have
copies of the first and second editions in stock. (06.4)
l We directly observed wideband slow light in a phonic crystal directional
coupler. (06.3)
l Our group manufactured functional emitters by way of a trial, in which
were in control of the delay time by spinning around two AWG. (06.3)
l We achieved switching characteristics of photonic crystal with liquid
crystal. (06.3)
l We were one of 24 groups (out of 400 groups) to win the prize of the
Japan Society for the Promotion of Science. (06.3)
l The condition of focusing by superlens was observed more clearly. (06.2)
l The fabrication of an active/passive-integrated photonic crystal laser
succeeded for the first time. (06.2)
l We succeeded in abstracting a slightly stronger light than scattering
light from microdisks, through bonding nanowire waveguides with disks. (06.1)
l Si nanowire AWG has steadily improved, and the sidelobe level reached
approximately 20 dB. (05.12)
l We demonstrated slow light, which was characteristic of a photonic
crystal waveguide, by lasing in cooperation with the Furukawa Electric Co. Ltd.
(05.10)
l Our new project, innovation for new-generation optical communications,
was accepted as Priority Research by Ministry of Education. (05.8)
l Our group observed focusing on flat surface photonic crystal slabs. (05.7)
l We fabricated photonic molecules with photonic crystal instead of a
microdisk and observed bonding modes. (05.7)
l Kosuke Sasaki of our group, who is currently seeking his masters degree, won
the Best Student Award at CLEO-PRO 2005 (the Pacific Rim Conference on Lasers
and Electro-Optics 2005) in Tokyo. He gave a paper on an ultrasmall AWG. Many
splendid scholars, including Fan, Y-H Lee, Kuipers, Lipson, Notomi, Painter,
Yablonovitch, Choquett, Forcel, Vucovic, Gibbs, DeLa Rue, and Yamamoto, joined
the conference. (05.7)
l The International Quantum Electronics Conference 2005 and the Pacific Rim
Conference on Lasers and Electro-Optics 2005 (IQEC/CLEO-PR 2005), one of the
biggest internal events in this year, were held in Tokyo to commemorate the
hundredth anniversary of Albert Einsteins Theory of Special and General
Relativity. (05.7)
l This was the first time that the active/passive-integrated photonic
crystal had been observed. (05.7)
l Professor W. Zheng who was our first resident guest from overseas has
returned to China after a two and a half month stay. We were all spurred on by
her unique presence and energy. (05.6)
l PECS VI (International Symposium on Photonic and Electromagnetic Crystal
Structures) was held at Crete, Greece. (05.6)
l Professor W. Zheng visited our group from the Chinese Academy of Science
and Technology to pursue the study of photonic crystal, providing a good
opportunity for us to converse in English. (05.4)
l We succeeded in increasing the rotation angle by ten fold, by blending
photonic crystal and liquid crystal. (05.2)
l Operation of an extremely small point-shift photonic crystal nanolaser,
which is theoretically the smallest laser, was demonstrated. (05.2)
l Our research enabled the fabrication of an ultrasmall AWG, based on the
Si nanowire waveguide. (05.2)
l Bistability has already been observed, and moreover, mode switching was
discovered. (05.2)
l We fabricated new group delay emitters by improving directional couplers
with chirped structure photonic crystal waveguides. (05.1)
l Our group demonstrated a compact spectroscopy system, invented by NEC, by
FDTD combining a superlens with a superprism. (05.1)
l Our group fabricated deep-slot structure photonic crystal waveguides,
despite the trend to focus on film slab structure, and observed the light
transmission on these waveguides. (05.1)
l I delivered a lecture at National Taiwan University. I am grateful that
there were many listeners despite the lecture being scheduled on a Saturday,
which was also Christmas Day. (04.12)
l Our group read a paper in cooperation with Ricoh Co. at the 17th
IEEE/LEOS Annual Meeting at Puerto Rico. The paper discussed the effect of
simple photonic crystal waveguides in an optical buffer. (04.11)
l The Technical Group on Silicon Photonics, a new society for study
presided over by the Institute of Electronics, Information and Communication
Engineers, was started. (04.10)
l Prof. C.C.Hasnain of Barkley University presented our study, which was
conducted in cooperated with Sony, at ECOC, for vertical cavity surface-emitting
lasers as the highest output power record for a single mode VCDEL. (04.9)
l The bistable operation of photonic molecule was observed with a low
threshold of 70 mW. (04.8)
l The students of the S. Fan group at Stanford University visited our group
and discussed the future of photonic crystals and optical technology. (04.8)
l The students of the K. Choquette group at the University of Illinois
visited our group and gave a talk on photonic crystal VCSEL. (04.8)
l We confirmed the possibility of oscillating an extremely small laser with
a quasi-periodic PC. (04.8)
l Our group has obtained a new room and a cluster computer system with 60
personal computers. (04.7)
l We achieved the worlds highest output power by a vertical cavity surface
emitting laser of lateral mode with a holy structure. (04.5)
l Professor John Sajeev of the University of Toronto, one of pioneers of
photonic crystals, came to Japan to attend the COE meeting. He gave an
interesting lecture on the use of CG. (04.3)
l We achieved room temperature cw lasing by quantum dot microdisks. The
effective threshold was approximately 80 mW. (04.3)
l Our group succeeded in observing the Purcell effect directly using a
point defect PC cavity at room temperature. (04.2)
l We observed bistability in ultrasmall cavity lasers bonding with
microdisks. It is expected they can be applied to an optical flip-flop. (04.2)
l Our group improved the MZI interferometer with a Si photonic nanowire
waveguide and achieved an extinction ratio of over 20 dB. (04.2)
l A total of 100 papers on photonic crystal and photonic nanostructure were
accepted at the Japan Society of Applied Physics Spring Meeting. Our group sent
21 papers to the meeting. (04.1)
l We found the structure of photonic crystal superprism that could operate
at a loss as low as 0.3 dB. (04.1)
l We were successful in lasing by the worlds smallest point defect PC
laser, following the California Institute of Technology and Korea Institute of
Science and Technology. (04.1)
l We designed an emitter that generated a 1-ns delay maintaining a wave of
ultrashort pulse by adjusting the structures of photonic crystal waveguides. If
we can tune these structures, it appears to be the best method that is
currently available. (03.12)
l Dr. Noda of Kyoto University, Dr. Norris of the University of Minnesota,
and I lectured at the 2003 Japan-America Frontier of Science of Engineering
Symposium on behalf of the physics and chemical contingent. (03.12)
l Matsushita Electric Industrial Co., Ltd. applied the surface grating LED
designed by our group to GaN blue devices. It is expected to accelerate the
advancement of PC-LED. (03.9)
l We improved AWG through modifying a design of Si nanowire waveguide AWG,
and observed demultiplexing characteristics. (03.8)
l Room temperature lasing by photopumping succeeded through processing the
dot wafer supplied by the Arakawa group at the University of Tokyo. (03.8)
l We observed a resonant wavelength shift by photopumping a III-V
semiconductor point defect PC cavity. Tunability, although rare in such cases,
was possible. (03.7)
l Two American students at the Georgia Institute of Technology visited our
group and discussed the subject of photonic crystals with us. (03.7)
l An English version of the roadmap on Photonic Crystals, edited by Dr.
Noda at Kyoto University and our group, was published by Kluwer Academic
Publishers. I am confident that it is a reliable photonic crystal guide. (03.6)
l We achieved room temperature lasing by photonic molecules made from
large-scale bonded microdisks. (03.5)
l We published Research Review vol. 2, which includes our results from 2000
to 2002. (03.3)
l We confirmed the initial operation of small emitters under 100 microns
square on AWG and MZI by Si nanowire. (03.3)
l We obtained a unique lasing mode, localized light energy on bends, and
branches of photonic crystal waveguides. (03.3)
l We achieved an initial operation of an AWG made from Si nanowaveguides by
miniaturizing them from 10 cm square, as before, to 100 microns square. (03.3)
l The 21st Century COE (Centers of Excellence) Program Symposium was held
at Yokohama National University Hall and enjoyed over 100 participants. (03.2)
l A paper on 3D photonic crystal, which described a joint study by RIKEN
and our group, appeared in Nature Materials. (03.1)
l We found a high-transmission-efficiency k-vector superprism. (02.11)
l Our group finally succeeded in lasing a photonic crystal slab point
defect laser, which was reported by the California Institute of Technology, the
University of Southern California, the Korea Advanced Institute of Science and
Technology, and the University of Lyon. (02.11)
l A photograph of microgear taken by our group was printed on the cover of
Photonics and Nanostructures, published by Elsevier Science. (02.9)
l A special issue featuring articles on photonic crystal, planned by IEEE
Journal of Quantum Electronics and edited by the University of St Andrews in
Scotland and our group, was published. (02.8)
l We observed room-temperature lasing by microdisks at intervals of 0.1 mm and a
fission of spectrum that showed that the microdisks bonded together. (02.7)
l We achieved a very-low-threshold room-temperature lasing of 11 mW by a
microgear laser. (02.7)
l The project studied by Prof. Arakawa at the University of Tokyo was
elected as one of seven candidates for the International Cutting-edge IT
National Research Project, Ministry of Education, Culture, Sports, Science and
Technology. This project conducts research on quantum dot and photonic crystal
studied by our group. (02.5)
l Dr. Hans Blom, who was on the register of our group four years ago, has
been in Japan as a research worker at a Japanese corporation. We exchanged
views on photonic crystals, mono photon illuminants, and DNA applications. (02.3)
l For the first time, our group observed emission near field images by
lasing disk lasers. As expected, the images were circular. (02.2)
l We observed Purcell effect at room temperature by measuring the life of a
photopumping microdisk. This technique has potential for high-speed emitters. (02.2)
l We achieved a low-threshold (17 mW) room-temperature cw lasing by photopumping microdisks with a diameter
of 1.7 mm, which is, in theory, the smallest disk. (02.2)
l Our group found a solution of a superprism that must be used carefully
under a detailed plan. (02.1)
