Study the plasmonic property of gold nanorods highly above damage threshold via single-pulse spectral hole-burning experiments

Abstract

Intense femtosecond laser irradiation reshapes gold nanorods, resulting in a persistent hole in the optical absorption spectrum of the nanorods at the wavelength of the laser. Single-pulse hole-burning experiments were performed in a mixture of nanorods with a broad absorption around 800 nm with a 35-fs laser with 800 nm wavelength and 6 mJ/pulse. A significant increase in hole burning width at an average fluence of 106 J/m2 has been found, suggesting a tripled damping coefficient of plasmon. This shows that the surface plasmonic effect still occurs at extremely high femtosecond laser fluences just before the nanorods are damaged and the remaining 10% plasmonic enhancement of light is at the fluence of 106 J/m2, which is several orders of magnitude higher than the damage threshold of the gold nanorods. Plasmon–photon interactions may also cause an increase in the damping coefficient.

The Effect of Femtosecond Laser Irradiation and Plasmon Field on the Degree of Conversion of a UDMA-TEGDMA Copolymer Nanocomposite Doped with Gold Nanorods

“…The longitudinal plasmon absorption band of the nanorods in the polymer (see Figure 4 a) is far from the blue light of the dental curing lamp used for polymerization. The transverse resonance peak of the gold nanorods, around 520–530 nm [ 36 ], is closer and could be held accountable; however, the emission spectrum of the dental curing lamp cuts abruptly at 510 nm [ 37 ], so the transverse excitation of the nanorods can also be considered negligible. The emission spectrum of the used QTH lamp is shown in Figure S9 in the Supplementary Information.…”

Laser-Induced Chirality of Plasmonic Nanoparticles Embedded in Porous Matrix

“…In this paper, we describe a novel method to induce chirality in achiral ensembles of gold NPs using the pulsed laser irradiation with circular polarization. We employ the method of spectral hole burning [ 24 , 25 , 26 , 27 ]. The essence of the method is that irradiation of plasmonic NPs with a resonant wavelength causes the particles to melt, change shape, and migrate.…”

“…The essence of the method is that irradiation of plasmonic NPs with a resonant wavelength causes the particles to melt, change shape, and migrate. The process leads to the formation of a dip in the absorption spectrum at the irradiation wavelength [ 27 , 28 , 29 ]. Contrary to all existing methods of fabrication of chiral plasmonic NPs, we propose here for the first time an effective method of inducing chirality in gold NPs embedded in the nanoporous silicate matrix (NPSM) using the spectral hole burning technique.…”

With Nanoplasmonics towards Fusion

“…In this way, we hope to assist with the effects from plasmonics, from the collective motion of electrons illuminated by intense and ultrashort, well-contrasted laser pulses. After the first few years of this project, carried out with modest means, we report our initial experiences of the enhancement of laser energy absorption due to nanoplasmonic effects, stemming from doping metal (Au) nanoantennas in a transparent polymer target [2][3][4][5][6][7].…”