ArticleCommunications chemistry2026
Probing non-radiative quantum relaxation in fluorophores using an optical fiber Bragg grating photothermal sensor.
Article in Communications chemistry, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
While optical fiber Bragg gratings (FBGs) have been exploited in the field of sensing, their potential for investigating quantum processes of photon-molecule interactions remains unexplored. Here, we experimentally demonstrated a method of probing photon-induced non-radiative thermal relaxation in fluorophores using the FBG technique. In response to various excitation wavelengths of photons, the FBG with fluorescent dye, Rhodamine B, present on its cladding, exhibits distinct Bragg wavelength shifts, reflecting the level of vibronic transitions and the absorption characteristics of the fluorophore based on non-radiative thermal release. The photoexcitation intensity-dependent response demonstrates that the FBG technique can probe localized photothermal relaxation at the micron-scale with LED intensity below 5 mW cm
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