2017 Fiscal Year Research-status Report
On-chip modulation of optical signals using plasmonic induced phase transitions for realizing all-optical circuitry
| Project/Area Number |
17K18867
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| Research Institution | The University of Tokyo |
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Principal Investigator |
J・J Delaunay 東京大学, 大学院工学系研究科(工学部), 准教授 (80376516)
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| Co-Investigator(Kenkyū-buntansha) |
松井 裕章 東京大学, 大学院工学系研究科(工学部), 准教授 (80397752)
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| Project Period (FY) |
2017-06-30 – 2019-03-31
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| Keywords | plasmonics / all-optical switching |
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| Outline of Annual Research Achievements |
The research goal is to modulate light (signal) using light (control) in an integrated on-chip device with reduced footprint and energy consumption. We design and fabricate a miniaturized low-power consumption all-optical modulator using a new hybrid nanostructure consisting of a sub-wavelength plasmonic grating coupled to phase-transition materials integrated in a waveguide.
In order to achieve all-optical high-speed modulation of optical signals, we have designed an optically pumped VO2 based nanoscale optical modulator in order to induce a high-speed modulation of the modulator’s optical transmission. The proposed design effectively traps 1064 nm pump light in the VO2, thus reducing the threshold for the optically induced phase of VO2. The nanoscale (320 nm by 300 nm by 550 nm) design additionally boasts an extremely high attenuation ratio of 26.85 microns, which exceeds the performance of prior thermally and electrically switched VO2 based optical modulators in the literature.
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| Current Status of Research Progress |
Current Status of Research Progress
2: Research has progressed on the whole more than it was originally planned.
Reason
The project parts related to the design and optimization of the device are completed. The design of our new device and its optimization were published in IEEE Photonics journal (10, 4800109, 2017).
The projects parts related to the experimental demonstration of the device are late due to the difficulty to build the pump probe setup. One device was fabricated as a test sample and is being used to realize the pump probe experiment.
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| Strategy for Future Research Activity |
The second year focus on the experimental demonstration of the device which was designed in the first year. First the active material of the device is deposited using pulsed laser ablation. Then the plasmonic nanostructure is fabricated using electron beam lithography, metal deposition and reactive etching. Finally the device property is investigated using the pump probe system, which will be completed in the second year.
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