| Project/Area Number |
23KF0203
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| Research Category |
Grant-in-Aid for JSPS Fellows
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| Allocation Type | Multi-year Fund |
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| Section | 外国 |
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| Review Section |
Basic Section 28020:Nanostructural physics-related
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| Research Institution | The University of Tokyo |
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Principal Investigator |
野村 政宏 東京大学, 生産技術研究所, 教授 (10466857)
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| Co-Investigator(Kenkyū-buntansha) |
DIEGO MICHELE 東京大学, 生産技術研究所, 外国人特別研究員
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| Project Period (FY) |
2023-11-15 – 2025-03-31
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| Project Status |
Discontinued (Fiscal Year 2023)
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| Budget Amount *help |
¥2,000,000 (Direct Cost: ¥2,000,000)
Fiscal Year 2025: ¥500,000 (Direct Cost: ¥500,000)
Fiscal Year 2024: ¥1,000,000 (Direct Cost: ¥1,000,000)
Fiscal Year 2023: ¥500,000 (Direct Cost: ¥500,000)
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| Keywords | Nanophononics / Nanomechanics / Phonon engineering / Phononic crystal / Phononic metamaterial / Phononic nanocavity / BrillouinLightScattering / Genetic algorithm |
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| Outline of Research at the Start |
This research aims to investigate new photonic/phononic devices for their potential as key building blocks of quantum networks. We pursue new phononic phenomena in hybrid resonators, made of phononic crystals coupled with piezoelectric transducers, with diamond structures as the main target.
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| Outline of Annual Research Achievements |
- Theoretical design and simulations of a hybrid double diamond-piezoelectric phononic nanocavity in which the piezoelectric cavity is used to activate modes in the diamond nanoresonator
- Optimization of the clean room fabrication process for piezoelectric (lithium niobate) and hybrid piezoelectric/Silicon nanostructures
- Theoretical design, clean room fabrication and experimental characterization (Vector Network Analyzer) of Gigahertz interdigital transducers on a piezoelectric material (lithium niobate). This is use to excite Gigahertz acoustical phonons in the piezoelectric material
- Theory, clean room fabrication and experimental validation (Brillouin light scattering) of a highly anisotropic two-dimensional Silicon phononic structure designed through genetic algorithm optimization
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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 is proceeding simultaneously on all three main pillars: (i) theory (development of the genetic algorithm in combination with finite element simulations for the design of new types of nanomechanical cavities, including piezoelectric/diamond and piezoelectric/silicon hybrid devices), (ii) clean room fabrication (optimization of the fabrication processes of lithium niobate piezoelectric material, deposition of interdigital transducers on lithium niobate and fabrication of piezoelectric/Silicon hybrid structures) and (iii) experimental characterization (installation and use of the vector network analyzer and optimization of an optical set up for Brillouin light scattering). Two works are completed and currently under review in two journals.
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| Strategy for Future Research Activity |
As a short-term goal (in the next few months) is the experimental characterization through vector network analyzer of hybrid nanostructures made of piezoelectric material and Silicon using interdigital transducers on the piezoelectric material to excite and detect acoustical waves and structural resonant modes. This could include both one-dimensional devices (such as nano-cavities) and two-dimensional devices (such as phononic crystals and metasurfaces).
Next we will move on to low-temperature characterization of these nanoresonators, so as to increase the lifetime of the resonant modes of such structures. Then, in collaboration with other groups, all the described processes of design optimization and experimental characterization will be applied for piezoelectric/diamond hybrid devices.
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