Adaptive Gap-Tunable Surface-Enhanced Raman Spectroscopy

• DOI: 10.1021/acs.nanolett.4c00289
• Publication Date: 2024-03-18T12:59:46Z
• Authors: Taeyoung Moon; Huitae Joo; Bamadev Das; Yeonjeong Koo; Mingu Kang; Hyeongwoo Lee; Sunghwan Kim; Cheng Chen; Yung Doug Suh; Dai-Sik Kim; Kyoung-Duck Park
• Keywords: Surface-Enhanced Raman Spectroscopy

Gap plasmon (GP) resonance in static surface-enhanced Raman spectroscopy (SERS) structures is generally too narrow and not tunable. Here, we present an adaptive gap-tunable SERS device to selectively enhance modulate different vibrational modes via active flexible Au nanogaps, with optical control. The tunability of GP up ∼1200 cm–1 by engineering gap width, facilitated mechanical bending a polyethylene terephthalate substrate. We confirm that the tuned enhances spectral regions molecules. Additionally, dynamically control intensity through wavefront shaping excitation beams. Furthermore, demonstrate simulation results, exhibiting properties one-dimensional nanogap their advantage high-speed biomedical sensing. Our work provides unique approach for observing controlling enhanced chemical responses dynamic tunability.