科研之友
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摘要
We report on the numerically and analytically investigated plasmonic and photothermal responses of a nanomatryushka structure composed of silver concentric nanoshells which exhibited strong plasmon resonance localization in the optical frequencies. Illuminating an isolated silver nanomatryushka in an aqueous system, we calculated the photothermal response of the structure and quantified the absorbed optical power and generated photothermal heat. In addition, it is shown that a couple of nanomatryushka structures as a symmetric molecular dimer in weak and strong coupling regimes are able to support strong plasmon resonances in the visible to the near-infrared region. Utilizing strong near-field coupling in the metallic nanostructures and hybridization of plasmons, and also employing silver as a highly absorptive material at the visible spectrum, we increased the energy dissipation per unit volume almost three orders of magnitude in comparison to the other analogous subwavelength structures. Employing numerical methods, we showed that a symmetric metallic nanomatryushka dimer is able to generate enough photothermal heat which could result in a remarkable amount of temperature change (Delta T = 140 K) at the picosecond time scale. According to hybridization theory, the symmetric dimer is able to support strong bonding and antibonding plasmon resonant modes. Utilizing concentric nanoshells with high geometrical tunability facilitates using all of the surfaces and center of nanoparticles to generate heat with a large temperature change within a short relaxation time. This understanding opens new avenues to utilize simple nanoparticle orientations to generate significant heat power in an extremely short time scale for cancer therapy, photothermal therapy, and biological applications.
- 出版日期2016-4
