Alteration of Absorption Spectra with Variations in Gold Nanocage Geometries: A Numerical Study
Keywords:
nanocage, photothermal therapy, nanoparticle, optics, photothermal energy, plasmonics, absorption SpectrumAbstract
Nanocages are one of the vastly exploited nanoparticles in photothermal therapy and drug delivery via exciting their localized surface plasmon resonance (LSPR). LSPR depends on the nanoparticle shape, size, and orientation. Any alteration in the particle’s geometry can significantly shift its LSPR and can be accompanied by a drop in absorption power. This is a drawback in photothermal-based applications where field intensity and resonance wavelength accuracy determine the treatment efficiency. Nanocages differ from typical solid geometries because they are porous along all the orthogonal axes. Thus, for an optimized response, additional consideration must be given to the effect of their dimensions on the resonance. We examine the absorption of nanocages with various geometric features using full-wave electromagnetic analysis via the commercial software COMSOL. Furthermore, we investigate the spectrum variations of nanocages with multiple aspect ratios and detect their energy distribution in several peaks and the impact of truncated edges on the spectrum. Moreover, for colloidal nanoparticles, we demonstrate the absorption polarization sensitivity of nanocages at random orientations, where particle orientations significantly affect their absorption spectrum. Our study presents a beneficial view regarding geometry effects on metallic nanocages LSPR, which can be utilized for optimizing photothermal response in different biomedical applications.
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