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Proceedings Paper

Laser beam reflection by nano-designed two-layer nanostructured carbonic material formed in transparent hydrocarbon polymer by ion implantation
Author(s): Georgi B. Hadjichristov; Ivan L. Stefanov
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Paper Abstract

We investigated laser beam reflection by optically-transparent hydrocarbon polymeric material subjected to low-energy ion implantation. In our study were measured 5 mm-thick plates of polymethylmethacrylate (PMMA) implanted with silicon ions (Si+) accelerated to a relatively low energy of 50 keV at Si+ fluence of 1016 ions/cm2. Due to ion-produced destruction of the polymer network and reorganization of the organic structure in a depth of PMMA plate, a buried ion-modified layer with ~ 80 nm thickness is formed within the PMMA. The material in this ultra-thin nano-sized layer beneath the top surface of PMMA (in a depth of ~ 100 nm) is organized in carbon nanoclusters with a mean size of about 2 - 3 nm. The nonlinear gradual in-depth distribution of the complex refractive index in the nanostructured region of the polymer results in a significant modification of the reflection of coherent light by the formed structure. Also, the reflected beam undergoes a strong laser-induced photothermal interface lensing upon irradiation by CW laser ( λ= 532 nm) with an optical power above 30 mW. The presence of thermo-lenses can limit the optical and photonic applications of transparent ion-implanted polymers. Here, this negative effect is studied as dependent on both incident laser power and incidence angle of the laser beam.

Paper Details

Date Published: 30 December 2019
PDF: 10 pages
Proc. SPIE 11332, International Conference on Quantum, Nonlinear, and Nanophotonics 2019 (ICQNN 2019), 1133208 (30 December 2019); doi: 10.1117/12.2548745
Show Author Affiliations
Georgi B. Hadjichristov, Institute of Solid State Physics (Bulgaria)
Ivan L. Stefanov, Sofia Univ. St. Kliment Ohridksi (Bulgaria)

Published in SPIE Proceedings Vol. 11332:
International Conference on Quantum, Nonlinear, and Nanophotonics 2019 (ICQNN 2019)
Alexander A. Dreischuh; Tony Spassov; Isabelle Staude; Dragomir N. Neshev, Editor(s)

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