[10p-E217-1~19] 9.2 Nanoparticles, Nanowires and Nanosheets

6:45 PM - 7:00 PM JST(9:45 AM - 10:00 AM UTC)English Presentation

[10p-E217-19] Photothermal Response of Surface-Immobilized Gold Nanosphere Structures

〇Tong Zhou¹, Maria Vanessa Balois-Oguchi¹, Kotaro Kajikawa¹ (1.Science Tokyo, Eng.)

Keywords:

localized surface plasmon resonance,photothermal effect,Multiphysics Calculation

Plasmonic platforms based on surface-immobilized gold nanospheres (SIGNs) concentrate light into a nanometric gap to enhance Raman and nonlinear signals, but the accompanying absorption heats the metal and can damage the sample. Using coupled optical and thermal finite-element simulations (COMSOL), we evaluate the steady-state heating of a 50-nm gold sphere placed 1 nm above a gold film of varying thickness on glass under p-polarized light. The absorption efficiency, gap field enhancement, and temperature rise all show a gap-mode resonance near 610 nm that grows with film thickness; at about 1 mW focused to a 1-µm spot the peak temperature rise is of order 100 °C. Because the temperature rise closely tracks the gap field enhancement, it can be predicted from electromagnetic simulations alone, guiding the design of SIGN substrates that combine strong enhancement with minimal heating.