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

Journal article

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.

Authors: Kim, S; Jeong, T; Taylor, RA; Kyhm, K; Kim, Y

• Publication status: Published
• Peer review status: Peer reviewed
• Publisher: SpringerOpen
• Journal: Photonix
• Volume: 6
• Issue: 1
• Article number: 12
• Publication date: 2025-04-14
• Acceptance date: 2025-04-01
• DOI: 10.1186/s43074-025-00170-x
• EISSN: 2662-1991
• Language: English
• Keywords: Plasmonics; Chip-scale acousto-optic phase modulation; Optical spectroscopy; Frequency comb; Polydimethylsiloxane