سمینار عمومی هفتگی ۶ تیر ۱۴۰5

عنوان: Tuning Plasmon-Exciton Coupling in Rhodamine 6G-Coated Silver Nanoislands by Photo-Induced Self-Organization

سخنران: دکتر عباس چیمه (دانشگاه تهران)

شنبه ۶ تیر ۱۴۰۵، ساعت ۱۵، آمفی‌تئاتر دانشکده

چکیده:
Plasmon-exciton coupling in metal-organic nanostructures enables extreme light-matter interactions that underpin ultrasensitive biosensors, low-threshold lasers, single-photon sources, and quantum nanophotonic devices. However, tuning this coupling remains challenging because most systems rely on fixed geometries. Here, we demonstrate tunable coupling between localized surface plasmons (LSPs) in granular silver films--known as silver nanoislands--and excitons in Rhodamine 6G molecules deposited on top. Controlled illumination induces self-organization of the silver grains into grating-like periodic arrays of nanoparticles. By simply varying the illumination duration, we achieve an anisotropically tunable LSP resonance that enables control over plasmon-exciton coupling. This work establishes photo-induced self-organization as a simple, all-optical route to post-fabrication tuning of plasmon-exciton coupling and provides a versatile platform for the fabrication of plexcitonic devices.