Hayato Takeuchi

Plasmonic near-field enhances photoelectrics in a Fabry–Pérot cavity heterostructure

Shin‐Chwen Yeh, Wen‐Yin Ko, Hayato Takeuchi, Keisuke Imaeda et autres

Fabry–Pérot (F–P) cavities integrated with plasmonic nanostructures offer an effective platform for enhancing light–matter interactions, yet simultaneously achieving >90% broadband absorption across visible-NIR range and strong near-field enhancement remains challenging due to intrinsic spectral limitations of plasmonic resonators and complex cavity design. …

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Gap-Controlled Plasmon Dephasing and Near-Field Confinement in Metal–Insulator–Metal Nanostructures

Hayato Takeuchi, Xiao-Tong Pan, Keisuke Imaeda, Sou Ryuzaki et autres

Plasmonic nanostructures confine light into nanoscale volumes via localized surface plasmon resonances, enhancing local electromagnetic fields and excitation probabilities of nearby molecules. However, their optical confinement time, represented by the plasmon dephasing time ( T 2 ), is inherently short due to …

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Joint Optimization of Sampling Rate Offsets and Demixing Filters Using Auxiliary Function Method

Hayato Takeuchi, Takao Kawamura, Nobutaka Ono, Shoko Araki

In this paper, we propose a blind source separation (BSS) method for signals affected by sampling rate offset (SRO), which occasionally occurs in distributed recording scenarios. Conventional approaches typically follow a two-step procedure: estimating and compensating for the SRO, followed by applying …

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Blind source separation with asynchronous signals based on joint optimization of sampling rate offsets and demixing filters

Hayato Takeuchi, Takao Kawamura, Nobutaka Ono, Shoko Araki

In this work, we propose a blind source separation (BSS) technique designed to handle signals affected by sampling rate offsets (SROs), which commonly occur in distributed recording environments. In the presence of SROs, conventional BSS methods do not work without synchronization. Existing …

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Synchronization of Signals with Sampling Rate Offset and Missing Data Using Dynamic Programming Matching

Hayato Takeuchi, Takao Kawamura, Nobutaka Ono, Shoko Araki

In this paper, we propose a blind synchronization method for signals with sampling rate offset (SRO) and missing data, which occasionally occurs in distributed recording for acoustic scene classification. In our method, the correspondence between short-time frames is first estimated using cross-correlation …

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Plasmon Dephasing and Near-Field Enhancement of Periodical Arrays of Au Nanogap Dimers

Keisuke Imaeda, Junfeng Yue, Hayato Takeuchi, Kosei Ueno

The manipulation of near-field enhancements in plasmonic nanostructures is essentially significant in boosting the performance of plasmon-enhanced near-fields in various applications. Far-field coupling induced in the periodically arrayed plasmonic nanostructures offers a promising platform for manipulating not only the near-field enhancements but …

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Exploring Hybrid States and Their Ultrafast Dynamics in Exciton–Plasmon Strong Coupling Systems

Hayato Takeuchi, Keisuke Imaeda, Sou Ryuzaki, Kosei Ueno

To enhance the interaction between light and matter, it is crucial to confine light into minute spaces while simultaneously slowing it down. Plasmon resonance has been a principle used to amplify the interaction between light and matter by acting as a nanoscale …

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Establishment of Laser Link Between Ground Station and Hayabusa2 LIDAR

Hirotomo Noda, Takahide Mizuno, Hiroo Kunimori, Hayato Takeuchi et autres

Study on topographic model using LIDAR for tsunami simulation

Y. Murashima, Hayato Takeuchi, Shunichi Koshimura, Kenji Fujiwara et autres

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New Insulator Film Of Integrated Capacitor For Silicon Strip Detector

S. Okuno, H. Ikeda, Tadao Akamine, Yutaka Saitoh et autres

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Radiation distribution sensing with normal optical fiber

Ryotaro Naka, Kenichi Watanabe, Jun Kawarabayashi, Akira Uritani et autres

The purpose of this study is to develop a radiation distribution monitor using a normal plastic optical fiber. The monitor has a long operating length and can obtain continuous radiation distributions. A principle of the position sensing is based on a time-of-flight …

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Basic study on radiation distribution sensing with normal optical fiber

Ryotaro Naka, Jun Kawarabayashi, Akira Uritani, T. Iguchi et autres

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