Plasmonic nanoprism distributions to promote enhanced and uniform energy deposition in passive and active targets
arxiv(2024)
摘要
Passive and active targets, implanted with gold nanoprisms, were designed to
achieve enhanced and uniform power absorption during two-sided illumination by
short laser pulses. The target length was adjusted to match the short laser
pulse-length. Capabilities of three different, uniform, single-peaked Gaussian
and adjusted, nanoresonator number density distributions were compared. The
average local E-field inside the gain medium and on the surface of the
nanoprisms were mapped as a function of the pump E-field strength and dye
concentration, assuming a uniform nanoresonator distribution. The optimal
parameters were adopted to each inspected nanoprism distributions. The
time-evolution of the near-field enhancement (NFE), integrated power-loss and
deposited energy were determined, additionally, the time-evolution of the
standard deviation of these quantities was monitored. A comparative study was
performed on passive and active targets, to determine the most advantageous
nanoprism number density distribution type and to consider the advantages of
dye doping. Based on the results, the adjusted distribution is proposed both in
passive and active targets. Doping with the dye is advantageous in every
inspected distribution in decreasing the minimal standard deviation of the NFE.
It is advantageous in decreasing the delay of the minimal standard deviation in
the power-loss and deposited energy, the standard deviation of the NFE as well
as in increasing the FOM of the NFE in the uniform and adjusted distributions.
In addition, doping allows for decreasing the delay of the minimal standard
deviation in the NFE / increasing the mean NFE / decreasing the standard
deviation of the power-loss and deposited energy in the uniform / Gaussian /
adjusted distribution.
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