Structural and optical properties of nanoparticles formed by laser ablation of porous silicon in liquids: Perspectives in biophotonics

Journal Article · Wed Jan 01 00:00:00 EST 2020 · Quantum Electronics (Woodbury, N.Y.)

DOI:https://doi.org/10.1070/QEL17208· OSTI ID:23141870

Zabotnov, S. V.; Kashaev, F. V.; Skobelkina, A. V.; Kolchin, A. V.; Kaminskaya, T. P.; Agrba, P. D.; Sergeeva, E. A.; Kashkarov, P. K.; Golovan, L. A. ^[1]; Kurakina, D. A.; Khilov, A. V.

---

1. Faculty of Physics, Lomonosov Moscow State University, Vorob’evy gory 1, 119991 Moscow (Russian Federation)

The paper discusses the possibility of manufacturing silicon nanoparticles, which are suitable for contrasting biological tissues imaged by optical coherence tomography, by femtosecond laser ablation of porous silicon in various liquids. The manufactured nanoparticles are characterised by average sizes of 87, 112, and 102 nm for cases of ablation in water, ethanol, and liquid nitrogen, respectively, as well as a relatively narrow size distribution, which provides additional advantages for subsequent delivery into biological tissues. Electrochemical etching, which results in the formation of layers of porous silicon, allows the yield of ablation products to be increased several-fold by lowering the ablation threshold, thereby increasing the light scattering efficiency of the prepared suspensions compared with the case of using crystalline silicon as targets. The possibility of obtaining high-contrast images of a biotissue phantom based on an agar gel with embedded nanoparticles is shown. The magnitude of the contrast depends on the liquid used for ablation and correlates with the values of the reduced scattering coefficient of the studied suspensions. (paper)

• OSTI ID: 23141870
• Journal Information: Quantum Electronics (Woodbury, N.Y.), Vol. 50, Issue 1; Other Information: Country of input: International Atomic Energy Agency (IAEA); ISSN 1063-7818
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
77 NANOSCIENCE AND NANOTECHNOLOGY
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ABLATION
COMPARATIVE EVALUATIONS
EFFICIENCY
ELECTROCHEMISTRY
ETHANOL
GELS
LASERS
LAYERS
LIQUIDS
NANOPARTICLES
NITROGEN
OPTICAL PROPERTIES
POROUS MATERIALS
SILICON
SUSPENSIONS
WATER