Surface Plasmon Photonics

Surface Plasmon Photonics

👓 Hongxing Xu
Surface Plasmon Photonics

Surface Plasmon Photonics

✅ This thesis deals with the optical 💽 properties of Localized surface plasmon resonances (SPR) determine the main optical 💽 properties of Ag and ➕ Au nanoparticles in the visible. Under certain conditions, SPR can 🥫 give 🎁➡️ rise to single molecule sensitivity in surface-enhanced Raman scattering (SERS). The experimental 🥼 observation of dimer 🔅 structures, where two 2️⃣ Ag particles are bridged by a single hemoglobin molecule, probably reveal the simplest nanoparticle system that can 🥫 amplify Raman scattering to the extent that vibrational spectra of single molecules can 🥫 be recorded ⏺️. More controllable 🎛️ interparticle coupling 👩‍❤️‍💋‍👨 effects are observed for nanofabricated Ag particles on Si. The generalized Mie theory (GMT) has been used to analyze the mechanisms 👨‍🔧 of single molecule SERS, which indicates that the electromagnetic enhancement mechanism 👨‍🔧 is the main contributor to SERS. GMT is also used to theoretically quantify optical 💽 forces associated with Ag nanoparticles. The results indicate that molecules can 🥫 be trapped and ➕ particle aggregates deformed by the optical 💽 forces induced at SPR excitation.



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