3 research outputs found
Comparative study on the uniform energy deposition achievable via optimized plasmonic nanoresonator distributions
Plasmonic nanoresonators of core-shell composition and nanorod shape were
optimized to tune their absorption cross-section maximum to the central
wavelength of a short pulse. Their distribution along a pulse-length scaled
target was optimized to maximize the absorptance with the criterion of minimal
absorption difference in between neighbouring layers. Successive approximation
of layer distributions made it possible to ensure almost uniform deposited
energy distribution up until the maximal overlap of two counter-propagating
pulses. Based on the larger absorptance and smaller uncertainty in absorptance
and energy distribution core-shell nanoresonators override the nanorods.
However, optimization of both nanoresonator distributions has potential
applications, where efficient and uniform energy deposition is crucial,
including phase transitions and even fusion
Comparative study on the uniform energy deposition achievable via optimized plasmonic nanoresonator distributions
Plasmonic nanoresonators of core鈥搒hell composition and nanorod shape were optimized to tune their absorption cross-section maximum to the central wavelength of a short laser pulse. The number density distribution of randomly located nanoresonators along a laser pulse-length scaled target was numerically optimized to maximize the absorptance with the criterion of minimal absorption difference between neighboring layers illuminated by two counter-propagating laser pulses. Wide Gaussian number density distribution of core鈥搒hell nanoparticles and nanorods enabled to improve the absorptance with low standard deviation; however, the energy deposited until the overlap of the two laser pulses exhibited a considerable standard deviation. Successive adjustment resulted in narrower Gaussian number density distributions that made it possible to ensure almost uniform distribution of the deposited energy integrated until the maximal overlap of the two laser pulses. While for core鈥搒hell nanoparticles the standard deviation of absorptance could be preserved, for the nanorods it was compromised. Considering the larger and polarization independent absorption cross-section as well as the simultaneously achievable smaller standard deviation of absorptance and deposited energy distribution, the core鈥搒hell nanoparticles outperform the nanorods both in optimized and adjusted nanoresonator distributions. Exception is the standard deviation of deposited energy distribution considered for the complete layers that is smaller in the adjusted nanorod distribution. Optimization of both nanoresonator distributions has potential applications, where efficient and uniform energy deposition is crucial, including biomedical applications, phase transitions, and even fusion