Laser beam reflection by nano-designed two-layer nanostructured carbonic material formed in transparent hydrocarbon polymer by ion implantation

Georgi B. Hadjichristov; Ivan L. Stefanov

doi:10.1117/12.2548745

30 December 2019 Laser beam reflection by nano-designed two-layer nanostructured carbonic material formed in transparent hydrocarbon polymer by ion implantation

Georgi B. Hadjichristov, Ivan L. Stefanov

Author Affiliations +

Proceedings Volume 11332, International Conference on Quantum, Nonlinear, and Nanophotonics 2019 (ICQNN 2019); 1133208 (2019) https://doi.org/10.1117/12.2548745
Event: International Conference on Quantum, Nonlinear, and Nanophotonics 2019 (ICQNN 2019), 2019, Sofia, Bulgaria

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.

Citation Download Citation

Georgi B. Hadjichristov and Ivan L. Stefanov "Laser beam reflection by nano-designed two-layer nanostructured carbonic material formed in transparent hydrocarbon polymer by ion implantation", Proc. SPIE 11332, International Conference on Quantum, Nonlinear, and Nanophotonics 2019 (ICQNN 2019), 1133208 (30 December 2019); https://doi.org/10.1117/12.2548745

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