Nonlinear mechano-optical effects and speckle fringe patterns exhibited by gold-platinum nanoparticles in cells

C. Torres-Torres; B. E. García-Pérez; M. Trejo-Valdez

doi:10.1117/12.2317786

7 September 2018 Nonlinear mechano-optical effects and speckle fringe patterns exhibited by gold-platinum nanoparticles in cells

C. Torres-Torres, B. E. García-Pérez, M. Trejo-Valdez

Author Affiliations +

Proceedings Volume 10834, Speckle 2018: VII International Conference on Speckle Metrology; 108340G (2018) https://doi.org/10.1117/12.2317786
Event: SPECKLE 2018: VII International Conference on Speckle Metrology, 2018, Janów Podlaski, Poland

Abstract

Speckle fringe patterns modulated by the third-order nonlinear optical behavior of Gold-Platinum nanoparticles in rotation were analyzed by a two-wave mixing configuration. Random interference patterns derived by speckles were obtained by employing a Nd:YAG laser system featuring nanosecond pulses at 532 nm wavelength for the measurements. The nanostructured samples were prepared by a sol-gel method and contained in a water suspension. Transmission electronic microscopy, UV-vis spectroscopy and Energy-dispersive X-ray spectroscopy studies were undertaken in order to characterize the samples. The bimetallic nature of the nanoparticles gave origin to an optically anisotropic response related to nonlinear optics enhanced by plasmonic excitations. The orientation of the samples produced important changes in the ratio between the real and imaginary parts of the third-order nonlinear optical susceptibility. Gyroscopic properties of the samples confirmed the possibility to identify mechanical motion of the system through the evaluation of induced birefringence and multi-photonic absorption. Vectorial self-diffraction signals generated by two-wave mixing experiments were explored to reveal the mechanisms responsible for the nonlinearities observed. The nanoparticles were incorporated in randomly distributed cells in order to monitor their mechanical activity by recording speckle fringe patterns. A self-focusing effect resulting from a positive nonlinear refractive index in the nanoparticles allowed us manipulating the location of the speckle fringe pattern; and then, a focusing system dependent on irradiation was proposed for the observation of mechano-optical processes. Nonlinear optical interactions for performing ultrafast all-optical instrumentation functions can be contemplated.

Citation Download Citation

C. Torres-Torres, B. E. García-Pérez, and M. Trejo-Valdez "Nonlinear mechano-optical effects and speckle fringe patterns exhibited by gold-platinum nanoparticles in cells", Proc. SPIE 10834, Speckle 2018: VII International Conference on Speckle Metrology, 108340G (7 September 2018); https://doi.org/10.1117/12.2317786

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KEYWORDS

Nanoparticles

Speckle

Fringe analysis

Transmission electron microscopy

Two wave mixing

Nonlinear optics

Plasmonics

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