Journal: Photoacoustics

Article Title: Understanding the near-field photoacoustic spatiotemporal profile from nanostructures

doi: 10.1016/j.pacs.2022.100425

Figure Lengend Snippet: | Calculated anisotropic photoacoustic near-field spatial distribution generated by a gold nanorod. a , Optical absorption spectrum. The nanorod has a length of 160 nm and a width of 30 nm. The laser has a fluence of 1 mJ cm -2 and a wavelength of 1100 nm. The laser is circularly polarized to excite both the longitudinal and transverse modes of the nanorod. Note that the particular handedness (left or right) is not critical regarding the nanorod's absorption. The inset shows the electric field distribution on resonance (at 1100 nm). The absorption spectrum and the electric field distribution are simulated with a finite element solver (COMSOL Multiphysics 5.5, RF Module, Frequency domain). b, Absorption and second derivative of temperature as a function of time. The temperature profile is simulated using a finite element solver (COMSOL Heat Transfer Module). c, Numerical simulation of the photoacoustic (PA) pressure wave using the partial differential , simulated with a finite element solver (COMSOL, PDE Module). The corresponding time frames are marked as the red dots in b.

Article Snippet: We numerically simulate the thermal relaxation process with COMSOL Multiphysics 5.5 using the time domain heat transfer module.

Techniques: Generated