Interleaved frequency comb by chip-scale acousto-optic phase modulation at polydimethylsiloxane for higher-resolution direct plasmonic comb spectroscopy

1.
Department of Cogno-Mechatronics Engineering, College of Nanoscience and Nanotechnology, Pusan National University, 2 Busandaehak-Ro 63Beon-Gil, Busan, 46241, South Korea
2.
Department of Physics, Clarendon Laboratory, University of Oxford, Oxford, OX1 3PU, UK
3.
Department of Mechanical Engineering, Korea Advanced Institute of Science and Technology (KAIST), 291 Daehak-Ro, Yuseong-Gu, Daejeon, 34141, South Korea
4.
Department of Optics & Mechatronics Engineering, College of Nanoscience and Nanotechnology, Pusan National University, 2 Busandaehak-Ro 63Beon-Gil, Busan, 46241, South Korea

Funds: This work was supported by BrainLink program funded by the Ministry of Science and ICT through the National Research Foundation of Korea (RS- 2023 - 00236798) and BK21 FOUR Program by Pusan National University Research Grant, 2021. This work was supported by the National Research Foundation (NRF) grant funded by the Korean government (RS- 2024 - 00336583) and the Korea government (MSIT) (No. RS- 2024 - 00406152).

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Abstract: High-resolution spectroscopy unveils the fundamental physics of quantum states, molecular dynamics, and energy transfers. Ideally, a higher spectral resolution over a broader bandwidth is the prerequisite, but traditional spectroscopic techniques can only partially fulfill this requirement even with a bulky system. Here we report that a multi-frequency acousto-optic phase modulation at a chip-scale of soft polydimethylsiloxane can readily support a 200-times higher 0.5-MHz spectral resolution for the frequency-comb-based spectroscopy, while co-located plasmonic nanostructures mediate the strong light-matter interaction. These results suggest the potential of polydimethylsiloxane acousto-optic phase modulation for cost-effective, compact, multifunctional chip-scale tools in diverse applications such as quantum spectroscopy, high-finesse cavity analysis, and surface plasmonic spectroscopy.

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doi: 10.1186/s43074-025-00170-x

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Interleaved frequency comb by chip-scale acousto-optic phase modulation at polydimethylsiloxane for higher-resolution direct plasmonic comb spectroscopy

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doi: 10.1186/s43074-025-00170-x

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Interleaved frequency comb by chip-scale acousto-optic phase modulation at polydimethylsiloxane for higher-resolution direct plasmonic comb spectroscopy

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PhotoniX

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