The 2nd Sweden-Japan Workshop on Nanophotonics and Related Technologies
Few fields have experienced such a rapid growth in recent years as nanophotonics, fuelled by material progress (plasmonics, quantum dots, low dimensional structures in general) and improved insight into light material interaction on the nanometer scale, allowing applications in such varied fields as computer interconnects, telecom , medicine, lighting, solar energy harvesting to name a few.
This workshop is a sequel to an earlier one in 2009, where Swedish and Japanese researchers met to discuss current issues in nanophotonics, in contrast to the QNANO meetings, one of which was arranged last year 2011, which had a general nano scope. This workshop is exclusively devoted to nanophotonics. Thus the workshop aims at strengthening existing cooperation between Japan and Sweden as well as creating new ones in the field of nanophotonics.
Date: Monday 18 June 2012 to Tuesday 19 June 2012
Venue: Royal Institute of Technology (KTH), Isafjordsgatan 22, 164 40 Kista, Sweden
Lars Thylen, KTH
Lech Wosinski, KTH
- Motoichi Ohtsu (The University of Tokyo)
- Takashi Yatsui (The University of Tokyo)
- Tadashi Kawazoe (The University of Tokyo)
- Naoya Tate (The University of Tokyo)
- Wataru Nomura (The University of Tokyo)
- Makoto Naruse (NICT)
- Ferdinand Peper (NICT)
- Toshiharu Saiki (Keio Univ.)
- Masashi Aono (Riken)
- Katsuyuki Nobusada (Institute for Molecular Science)
- Akio Kaneta (Kyoto Univ.)
- Hiroaki Matsui (The University of Tokyo)
- Lars Thylen, KTH and HPL
- Anand Srinivasan, KTH
- Saulius Marcinkevicius, KTH
Min Qiu, KTH
- Lech Wosinski, KTH
- Petter Holmström, KTH
- Hans Ågren, KTH
- Sebastian Lourdudoss, KTH
- Valdas Pasinkevicius KTH
Jan Andersson, Acreo
- Laszlo B. Kish (Texas A&M Univ. / Uppsala University)
- Jan Linnros, KTH
- Anders Gustafsson, LTH
|Morning Session (Chair: Makoto Naruse)|
|9:00||Mo.1||Lars Thylen||Low power nanophotonics switches|
|9.25||Mo.2||Motoichi Ohtsu||Concepts of dressed photon science and technology|
|9.50||Mo.3||Anand Srinivasan||Semiconductor nanopillars for photonic applications|
|10.15||Mo.4||Takashi Yatsui||Nanophotonic device utilizing a dipole-forbidden energy state|
|11.10||Mo.5||Saulius Marcinkevicius||Scanning Near-Field Optical Microscopy of AlGaN and AlInN|
|11.35||Mo.6||Tadashi Kawazoe||Highly efficient Si homojunction infrared LED based on the dressed photon-assisted process|
|12:00||Mo.7||Petter Holmström||Nanoparticle-array devices for switching and interconnect|
|12.25||Mo.8||Naoya Tate||Design and Assembling of Nanometric System for Macro-scale Applications of Nanophotonics|
|Afternoon Session (Chair: Lars Thylen)|
|14.20||Mo.9||Lech Wosinski||Hybrid plasmonic waveguides and devices|
|14:55||Mo.10||Wataru Nomura||Dynamic properties of optical near-field signal transfer in random array of quantum dots|
|15:20||Mo.11||Min Yan (Min Qiu)||Photothermal effects in metallic nanostructures|
|15:45||Mo.12||Makoto Naruse||Stochastic approach to nanophotonics: Material formation and computing|
|16:40||Mo.13||Hans Ågren||Design of all-organic electrooptical meatrials|
|17:05||Mo.14||Ferdinand Peper||On fluctuation-driven circuits and their energy consumption|
|17:30||Mo.15||Sebastian Lourdudoss||Heteroepitaxial InP micro and nanostructures on Si for silicon photonics|
|Morning Session (Chair: Motoichi Ohtsu)|
|9:00||Tu.1||Toshiharu Saiki||Active nanophotonics with chalcogenide phase-change materials|
|9:25||Tu.2||Valdas Pasinkevicius||Quantum dots and carbon nanotubes for ultrashort pulse generation in lasers|
|9:50||Tu.3||Masashi Aono||Amoeba-inspired Problem Solver and its Application to Nanophotonic Computing|
|10:15||Tu.4||Amir Karim (Jan Andersson)||Nanophotonics applied to infrared detectors for achieving higher performance and/or lower production cost|
|11:10||Tu.5||Katsuyuki Nobusada||Near-Field Excitation in Nanostructure Arrays: Electron and Electromagnetic Field Fully-Coupled Dynamics|
|11:35||Tu.6||Laszlo B. Kish||Diffusion Noise and Photonic Shot Noise at Single Molecule Fluorescence in Micro/Nano-Fluidic Channels|
|Afternoon Session (Chair: Lech Wosinski)|
|13:30||Tu.7||Akio Kaneta||Recombination Dynamics in InGaN Single Quantum Wells by Scanning Near-field Optical Microscopy|
|13:55||Tu.8||Jan Linnros||Spectroscopy of single silicon quantum dots: New results on spectral features, blinking and exciton decays|
|14:20||Tu.9||Hiroaki Matsui||Polarization and electrnic structures controlled oxide quantum wells for optoelectronics|
|14:45||Tu.10||Anders Gustafsson||Optical properties of III-V nanowires studied by cathodoluminescence|
Boat trip, Tuesday 19th June, 19:30 – 22:30
Shrimp Buffet: Swedish tradition at it´s best!
We cast off from Nybrokajen at 7.30 p.m. for a 3-hour tour with masses of shrimp and authentic archipelago atmosphere. Onboard, you can also enjoy the sunset from the sundeck of the ship. If the weather permits, we also go ashore at a suitable place and enjoy the archipelago evening. The cruising will start at Nybrokajen shown below:
This was the second workshop of this kind, exclusively devoted to nanophotonics, but in its broad sense, including light material interaction on the nanometer scale, near field optics, plasmonics, quantum dots, subwavelength structures, as well as applications to computer interconnects, telecom, medicine, lighting, solar energy harvesting, to name a few.
The number of participants was limited to 25 persons (plus few KTH PhD students) to match the Japanese side consisting of 12 top researchers in the field. The significance of this meeting was highly appreciated by the Embassy of Japan in Sweden and the Japan Society for the Promotion of Sciences. Mr Hideto Matsumoto, first Secretary of the Japanese Embassy and Prof. Yoshiaki Fujii director of the Society visited Kista and gave two short talks during the workshop.
In general the most innovative contributions came from Japan, maybe to some extant reflecting short-sightedness of Swedish research financing or maybe lack of imagination on the Swedish part.
The papers that aroused most interest were those with some unconventional approach to photonics: "On fluctuation-driven circuits and their energy consumption", given by Ferdinand Peper from National Institute of Information and Communications Technology (NICT), Kobe, Japan and "Amoeba-inspired Problem Solver and its Application to Nanophotonic Computing" that was presented by Masashi Aono from RIKEN Advanced Science Institute, Hirosawa, Japan.
Ferdinand Peper proposed an alternative strategy to the ongoing trend towards higher integration densities and lower signal/noise ratios, in which noise is used to find solutions to computing problems by making signals perform a stochastic search in circuits, called Brownian circuits. The use of fluctuations in Brownian circuits resembles the way biological systems work. Evolved over millions of years in the presence of Brownian motion, biological systems have mechanisms in place that can exploit fluctuations efficiently, for example to make certain chemical agents react with other agents. Without Brownian motion, these agents will not find each other since they will stay where they are. This mechanism driven by Brownian motion is much simpler than a top-down controlled mechanism, especially when implemented on molecular scales. Like in biological systems, fluctuations can also be exploited in computer systems to make tokens search so that they can be operated upon in certain modules. It turns out that this modus operandi has several advantages. Brownian circuits tend to be less complex than circuits that have similar functionality but lack fluctuating tokens.
Masashi Aono presented a single-celled amoeboid organism that exhibits rich spatiotemporal oscillatory dynamics and efficient resource allocation capabilities. When placed in a chip having a number of lanes, the organism inherently grows its branches inside the lanes. This is because the organism tries to occupy the entire area inside the chip to maximize the absorption of nutrients from beneath an agar plate. However, the organism withdraws its branches when illuminated by light. This photo-avoidance behaviour enables one to induce the shape change of the organism by applying optical feedback stimulation. The author presented an experimental system called an “amoeba-based computer”, which employs the organism to search for a solution to the Travelling Salesman Problem.
Other contributions were more conventional, see technical program below. These included using the near field interactions and plasmonics for ICT and for photo thermal effects. Further, Si based LEDs, nanopillars and –wires in III V, all organic electrooptic materials, heteroepitaxy InP on Si were treated. Further talks concerned Si quantum dots and quantum dots in combination with carbon nanotubes.
The workshop ended with a pleasant boat cruise in Stockholm Archipelago, where the participants in the more relaxed form could continue their scientific discussions.
[text by Lars Thylen, 2012-07-13]