Resonant Nonplasmonic Nanoparticles for Efficient Temperature-Feedback Optical Heating

Abstract

We propose a novel photothermal approach based on resonant dielectric nanoparticles, which possess imaginary part of permittivity significantly smaller as compared to metal ones. We show both experimentally and theoretically that a spherical silicon nanoparticle with a magnetic quadrupolar Mie resonance converts light to heat up to 4 times more effectively than similar spherical gold nanoparticle at the same heating conditions. We observe photoinduced temperature raise up to 900 K with the silicon nanoparticle on a glass substrate at moderate intensities (<2 mW/μm) and typical laser wavelength (633 nm). The advantage of using crystalline silicon is the simplicity of local temperature control by means of Raman spectroscopy working in a broad range of temperatures, that is, up to the melting point of silicon (1690 K) with submicrometer spatial resolution. Our CMOS-compatible heater-thermometer nanoplatform paves the way to novel nonplasmonic photothermal applications, extending the temperature range and simplifying the thermoimaging procedure.

Non-Plasmonic SERS with Silicon: Is It Really Safe? New Insights into Opto-Thermics of Core/Shell Microbeads

“…Zograf et al recently demonstrated that in Si nanoparticles the optical field localization at magnetic quadrupolar resonance is able to generate a remarkable optical heating, despite its imaginary part of refractive index is two orders of magnitude lower than that of metals. 28 Our study corroborates those observations and provides new insights into opto-thermal management of Si-based systems, demonstrating that the local heating can be increased beyond the melting point of refractory materials. On the other hand, we also demonstrated that thermally-robust beads with outstanding…”

The conformation of bovine serum albumin adsorbed to the surface of single all‐dielectric nanoparticles following light‐induced heating

“…All‐dielectric NPs and nanostructures promote optical field localization near the surface and redirection of light to biomolecules that interact poorly with light. It also should be noted that such NPs are promising candidates for bioimaging , biosensing and heat therapy . In addition, most all‐dielectric NPs are rapidly bio‐degradable and relatively non‐toxic .…”

“…In addition, most all‐dielectric NPs are rapidly bio‐degradable and relatively non‐toxic . However, few available reports on biophotonic applications of such NPs have not addressed potential conformational changes in biomolecules adsorbed on their surface.…”

“…For light‐induced heating of NP‐biomolecule complexes, we followed a recently developed strategy to heat all‐dielectric NPs by light involving a regime with temperature feedback . As has been shown, the specific sizes of our NPs allowed resonant interaction with light, while the non‐zero imaginary part of its permittivity promoted light absorption and conversion of photon energy to heating up to 1200 K .…”

Enhancement of Raman scattering in dielectric nanostructures with electric and magnetic Mie resonances

“…Such nanostructures have recently revealed many features, which previously were available only for the plasmonic counterparts. Examples include single-molecule sensing [5,6], efficient harmonic generation [7][8][9], and, among others, photothermal activity [10]. This progress has stimulated the development of all-dielectric photonic devices, including nanoantennas, metasurfaces and optical interconnects [1,3,4].…”