2020 Fiscal Year Annual Research Report
A novel design of integrated optical circuits and nanolaser devices using 2D and quantum dot perovskites
| Project/Area Number |
20H02197
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| Research Institution | The University of Tokyo |
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Principal Investigator |
何 亜倫 東京大学, 大学院工学系研究科(工学部), 助教 (20815386)
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| Co-Investigator(Kenkyū-buntansha) |
項 栄 東京大学, 大学院工学系研究科(工学部), 准教授 (20740096)
八井 崇 豊橋技術科学大学, 工学(系)研究科(研究院), 教授 (80505248)
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| Project Period (FY) |
2020-04-01 – 2023-03-31
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| Keywords | ペロブスカイトナノ結晶 / perovskite nanocrystals / ナノレーザー / nanolasers / lithography / self-assembly |
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| Outline of Annual Research Achievements |
Perovskite nanocrystals exhibit outstanding performances in optoelectronics and nanophotonics, and they have been investigated as a promising medium for high-quality photonic devices such as nanolasers. However, for perovskite-based single-mode lasers to become practical, on-chip nanofabrication methods via the standard top-down lithography process are strongly desired. The bottleneck to achieving lithography of perovskites lies in their reactivity to chemicals used for lithography as illustrated by issues of instability, surface roughness, and internal defects with the fabricated structures. The realization of lithographic perovskite single-mode lasers in large areas remains a challenge.
In FY 2020, we investigated and presented a self-healing lithographic patterning method for perovskite nanocrystals, and further, we demonstrate large-area single-mode laser arrays based on CsPbBr3 perovskite nanocrystals.The self-healing process is compatible with the standard lithography process and greatly improves the quality of lithographic laser cavities.
A single-mode micro-disk laser array is demonstrated with a low threshold. This work presents a general and promising strategy for standard top-down lithography fabrication of high-quality perovskite devices and enables research on large-area perovskite-based integrated optoelectronic circuits.
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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
In this work, we develop a self-healing lithographic patterning technique using perovskite CsPbBr3 nanocrystals, and it is demonstrated to realize high-quality and high-crystallinity single-mode laser arrays.
This self-healing lithographic patterning technique, consisting of ligand engineering and self-assembly of perovskite NCs, has the unique advantages of being compatible with the standard top-down lithography processes and enabling the fabrication of high-quality, crystallinity, and precisely size-controlled optical cavities based on lead halide perovskites.
Accordingly, the laser array with the self-healing process exhibits promising single-mode lasing at a low threshold of 3.8 μJ/cm2 at room temperature, which is two-order lower than that of the laser array without the self-healing process.
Due to the precise control of the dimensions of the laser cavities, the single-mode lasing wavelength is controlled over a range of up to 6.4 nm.
The result of this work has been published in Advanced Functional Materials and presented at international conferences.
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| Strategy for Future Research Activity |
Based on the experiences of nanofabrication on perovskite nanocrystal, we will further design and fabricated the plasmonic waveguide and lattice nanolaser as the next step.
Plasmonic nanolasers provide a valuable opportunity for expanding subwavelength applications; however, perovskite nanocrystal-based plasmonic lasers, especially nanolasers that support plasmonic-waveguide mode, are still a challenge and remain unexplored.
Also, the plasmonic lattice laser is a promising wavelength-scale laser device for the directional lasing emission, which could be used in various applications including sensing, imaging, and data communications.
To further integrate perovskite laser for further nanophotonic applications, we will design and demonstrate the coupling between nanolaser and low-loss waveguide via all top-down nanofabrication to control light propagating on a small footprint with low-loss optical modes.
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| Remarks |
It is very rude to have no option of "Taiwan" in the list of counterpart countries.
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