CLEO-PR 2013 Hiroshi Kudo


CLEO-PR & OECC/PS 2013 @ KYOTO Conference Report

Hiroshi Kudo, 2nd year master student, Tanabe Laboratory

July 4, 2013

Oral presentations were given at CLEO 2013-PR/OECC in Kyoto, Japan, from June 30 to July 4, 2013.
In this report, we report our impressions through this conference.

Sightseeing 】

This time, I went sightseeing mainly in Arashiyama, Sagano and Rakunan area. First, we went down the Hozu River, which takes about two hours from Saga-Arashiyama Station via a trolley and a bus. The boatman's entertaining guide took us slowly down the river, but we also experienced a thrilling whitewater slide, which was very interesting. The tour also allowed us to forget the hustle and bustle of daily life by taking a leisurely stroll along the bamboo grove street and Fushimi Inari Shrine. Although it was the rainy season, the weather was fine during the conference and it was a perfect day for sightseeing.

[Own presentation].

In this report, the influence of the radius of curvature of polygonal resonators on the Q-value was reported mainly by numerical analysis. I think my presentation was reasonably well done compared to the previous one at CLEO 2013. I gave myself a score of 70. However, the audience did not respond well to my presentation, partly because it was far from the field of the session. In the future, I would like to report interesting research that would be of interest to the audience even across sessions.

Hiroshi Kudo

Noted Research (Oral Presentations)

Wl1-1 Diamond Nanophotonics and Quantum Optics, Marko Loncar
As the title suggests, this is a research aiming at quantum applications using diamond structures, and the fabrication technology is simply amazing. The ring resonators and one-dimensional photonic crystals, which were conventionally fabricated by silicon, were achieved by using diamond, and in the case of silica race-track ring resonators, Q=1.25×105 was achieved by covering the surface with SiO2 as a cladding. (Without SiO2 cladding, Q=3.0×104). He also reported the recent achievement of Q > 106 and its application to optical frequency comb with low noise such as heat.

reference data
∙ S. Y. Lee et al, "Integrated High Quality Factor Optical Resonators in Diamond," Nano Letters, DOI: 10.1021/nl3037454 (2013).
... M. J. Burek et al. "Free-Standing Mechanical and Photonic Nanostructures in Single-Crystal Diamond," Nano Letters, vol. 12, 6084 (2012).
MI1-1 Hybrid III-V/SOI Nanophotonics: Lasers, Switches and Memories, F. Raineri et al, SOI (Silicon on Insulator) is, as the name implies, Si with an embedded oxide film, a technology developed by IBM, and has contributed greatly to high-speed communication and low power consumption of LSIs. In this paper, we report experimental results of laser and memory operation using InP-based 1D photonic crystals with InGaAsP/InGaSa quantum wells embedded on SOI waveguides, which emit light at 1.55 um on the substrate, and confirmed memory operation at 1 fJ and over 2 sec by combining III-V semiconductor and SOI. sec by combining III-V semiconductors and SOI.

reference data
Y. Haliouaet al., "Hybrid III-V semiconductor/silicon nanolasers," Opt. Express 19, 9221-9231 (2011).

...Wl4-1 All-Color Plasmonic Nanolasers with Ultralow Thresholds, Yu-Jung Lu et al,
Generally, coupling of light and plasmon has a problem of large confinement loss in three dimensions. The epitaxial approach used in this study significantly reduces the loss, enabling highly efficient oscillation of plasmonic lasers. The device structure consists of InGaN and GaN rod nanorods placed on an Ag substrate on a silicon substrate with a thin silica layer in between, enabling highly efficient confinement of plasmons in the silica layer. By controlling the shape of the nanorods, the laser wavelength can be controlled from red to blue, and the operation was confirmed with low-power CW light (less than 10 W/cm2 in the case of blue).
reference data
Y.-J. Lu et al, "Single InGaN nanodisk light emitting diodes as full-color subwavelength light sources," Appl. Phys. Lett. 98, 233101, 2011.
Y.-J. Lu et al, "Plasmonic nanolaser using epitaxially grown silver film," Science, 337, 450-453, 2012.
...Wl4-2 Electrically Pumped Metallo-Dielectric Pedestal Nanolasers, Qing Gu et al,

...Wl4-2 Electrically Pumped Metallo-Dielectric Pedestal Nanolasers, Qing Gu et al,
We have succeeded in fabricating a nanocavity with two disk structures by two-step InP etching. The disk part is made of InGaAs, and is intended for laser applications. The Q-value and the threshold of laser oscillation were numerically determined by changing the diameters of the upper and lower disks, and the shape of the resonator was investigated. The laser oscillation operation was also confirmed using the fabricated resonator.

Wl4-3 Fabrication and Application of a Horizontal Plasmonic Air-Slot Ring Resonator, Jaehak Lee et al,
The Q value is still several tens both analytically and experimentally. The latter half of the presentation was a report on the applications, showing the tendency that the amount of shift increases when antibodies are attached to the resonator surface, and that it is useful for bio-sensing applications.

Wl4-4 Active Plasmon Devices, Kenzo Yamaguchi et al,
The Q value is still several tens both analytically and experimentally. The latter half of the presentation was a report on the applications, showing the tendency that the amount of shift increases when antibodies are attached to the resonator surface, and that it is useful for bio-sensing applications.

Wl4-4 Active Plasmon Devices, Kenzo Yamaguchi et al,
This is a report of numerical analysis of mechanically controlled nanoscale grating structures by applying an external electric field. The resonance frequency of surface plasmons generated around the grating structure changes with the change of the structure. The fabrication of devices using ion beams has also been achieved, and in the report, a moving image was shown of the structure change by connecting the wiring to the device and applying an external electric field.

∙ Wl4-6 Plasmonic Properties and Biosensing od Gold Elliptical Nanoring Arrays, Chia-Yang et al,
This is a report on the numerical analysis of the intensity of plasmon resonance and its wavelength shift for each polarization of light, using the length and width (R) of the ring structure as a variable. The analysis was performed for the circular structure and the circular hole structure to better understand the characteristics of the ring. As a conclusion, the tighter the horizontal to vertical ratio is, the better, and it seems to be considered for application to biosensing.

Notable Presentations (Poster)

TuPK-12 Lasing Characteristic of ZnO Microsphere Prepared by a Simple Laser Ablation Method, D. Nakamura et al,
The authors fabricated a circular micro optical resonator by laser ablation on a ZnO substrate and confirmed higher laser oscillation efficiency. In this study, three types of Q-switch lasers (355 nm, 532 nm, and 1064 nm) were used for the ablation, and while the surface of the resonator at 355 nm is uneven, a circular resonator can be fabricated at 532 nm and 1064 nm. Although the present report did not consider whether the crystallinity is maintained or not, we thought that the fabrication method by simply irradiating the laser is attractive.

TuPM-8 Permanent Tuning of high-Q Silicon Mirroring Resonators by Fs Laser Surface Modification, D. Backman et al,
This is a report of a study on post-processing of resonance shift in a silicon ring resonator by irradiating fs laser pulses. Post-processing studies have been conducted from various angles not only for silicon rings but also for photonic crystals and toroidal resonators in order to make final fine adjustments to the structure once fabricated. He also reported the application of this technique to a double-μ-ring filter to match the resonance frequencies of two ring resonators.

Ultrafast Dynamics of the Interlayer Shearing Mode in Au Graphite Nanostructures, M. F. Avila-Ortega et al,
Surface-enhanced Raman scattering is generated on the surface of a graphene substrate with a layer of gold nanoparticles deposited on it by irradiating an 80 MHz Ti:sapphire laser. Here, we reported the experimental results of the changes in the intensity and phase of the generated Raman spectra as a function of the thickness of the gold nanoparticle layer. Both intensity and phase showed discontinuous behavior around 20 Å thickness, and the cause is still unknown at this point, but will be investigated in the future.


On the fourth day of the conference, a banquet was held at the Grand Prince Hotel Kyoto next to the conference venue, and I attended it with Dr. Kannari and four students of Kannari Laboratory. The banquet was gorgeous, with maiko (apprentice geisha) and geisha singing, dancing, and serving, and it was a truly enjoyable two hours. In the middle of the banquet, an awarding ceremony was held, and Mr. Abe of Kannari Laboratory received the student award.
Congratulations, Mr. Abe!
Although it was frustrating to see him looking at me sideways, I came to the usual conclusion, "I will do my best in my research so as not to lose to Mr. Abe.


I had the impression that the main focus of CLEO-PR & OECC/PS 2013 was on experiments (especially, fabrication techniques), and I was especially surprised at the high level of technical skills of Prof. Loncar's group. In devices, the plasmon session was very exciting, with two tutorials and two sessions, but there were also many other sessions with strong relevance to the topic. Researchers from Tsinghua University, University of California, KAIST, Ehime University in Japan, and other institutions around the world presented their research results, and there were several reports that did not seem to be basic research. Even if the reports focused on analytical results, they were not merely ideas, but all of them eventually led to experimental results.
On the other hand, there are still elements in my research that can be improved as fabrication technology. I myself, listening to this report, feel more excited when the results of experiments are shown, and I find the research attractive. First of all, I would like to make my own research attractive to me.