RE:What is really at stake hereThis is an interesting find that involves phototherapy-fundamentals and may use Sona one day, IMO.
Some points pasted below and a link at the bottom.
NPs used in biomedicine must meet some requirements such as non-toxic, chemically stable, biocompatible and uniform in size, shape and concentration. NPs are the excellent candidates for cancer therapy because of their targeting functions, sustained drug release profiles, reduced side effects, and the ability to overcome multidrug resistance.
Using surface plasmon resonance (SPR) in various shapes of gold nanoparticles (GNP), such as spheres, rods, boxes, cages and shells have been developed [3-10]. By changing the shape of GNP from spheres to nanorods, the absorption and scattering peaks change from visible to the near-infrared (NIR) regime. Comparing to the visible light, light in the NIR regime offers the advantages of larger absorption and scattering cross sections and much deeper penetration depth in tissues [5-7]. The red-shift of the absorption peak in gold nanorods is governed by the aspect ratio (defined by as the ratio of the length to the cross-sectional diameter), whereas it is governed by the shell thickness in nanoshells [5,6]. Lin et al., [8,9] proposed the use of a near IR diode laser system having multiple wavelengths for more efficient treatment of cancer tumor. To overcome the penetration issue, Lin et al., [8,9] also proposed the use of a train-pulse to increase the volume temperature increase which is particularly useful to larger volume tumors, unless an inserting fiber is used to deliver the laser energy. Various medical lasers and their fundamentals are reviewed by Lin [10].
https://www.oatext.com/progress-of-nanotechnology-for-phototherapy-fundamentals-and-applications.php#gsc.tab=0