The mass specific extinction coefficient and the polarization ratio at 90° of simulated smoke agglomerates are computed for clusters with 3 to 1390 primary spheres and for size parameter from 0.05 to 0.6 using the coupled electric and magnetic dipole (CEMD) method.
The coupled dipole mode is slightly red-shifted and the quadrupolar mode is enhanced in the solvent, probably due to its infiltration into the slightly porous matrix.
Using the covariant coupled-dipole approach, the effective material tensors of such a metamaterial are recovered, and contributions responsible for elliptical dichroism and optical activity are identified.
In FRET, the energy transfer process is based on the concept of coupled dipoles, which can exchange energy with another dipole with a similar resonance frequency [65].
Extinction curves are computed using the discrete dipole approximation (DDA).
This reduces the solution of Maxwell's equation to an algebraic problem involving many coupled dipoles.
These previous NP film T-LSPR studies are drastically different from the NP film system presented in this paper, where much larger, 60 nm NPs are used at much lower film surface coverage (∼5 NPs per μm), and all of the coupled NP film resonant dipoles have the same orientation (aligned normal to the gold film surface), excitable by p-polarized illumination.
For middle sources in Figure 5(b), the estimated dipole sources are lateral to the simulated dipole sources when using the BSCR larger than the correct value and the estimated dipole sources are mesial to the simulated dipole sources when using the BSCR smaller than the correct value.
The vibronic coupling constants and transition dipole moments for the Franck Condon and adiabatic S1 states of anthracene, 9-chloroanthracene, and 9,10-dichloroanthracene were calculated and analyzed by using the concept of vibronic coupling density (VCD).
Thus, the key to exciting the coupled NP film resonance using a transmitted, collinear optical extinction measurement is to place the sample at an angle relative to the light path so that the propagating beam has a polarization component that contributes to p-polarization and is capable of exciting the NP film dipole.
