Stimulated Thermal Scattering in Two-Photon Absorbing Nanocolloids under Laser Radiation of Nanosecond-to-Picosecond Pulse Widths
Recent discoveries in nonlinear optical properties of nanoparticle colloids make actual the challenge to lower the energy threshold of phase conjugation and move it into the domain of shorter pulse widths. A novel effect of the stimulated Rayleigh-Mie scattering (SRMS) in two-photon absorbing nanoco...
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MDPI AG
2022-07-01
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| Series: | Nanomaterials |
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| Online Access: | https://www.mdpi.com/2079-4991/12/15/2567 |
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| author | Alexander I. Erokhin Nikolay A. Bulychev Egor V. Parkevich Mikhail A. Medvedev Igor V. Smetanin |
| author_facet | Alexander I. Erokhin Nikolay A. Bulychev Egor V. Parkevich Mikhail A. Medvedev Igor V. Smetanin |
| author_sort | Alexander I. Erokhin |
| collection | DOAJ |
| description | Recent discoveries in nonlinear optical properties of nanoparticle colloids make actual the challenge to lower the energy threshold of phase conjugation and move it into the domain of shorter pulse widths. A novel effect of the stimulated Rayleigh-Mie scattering (SRMS) in two-photon absorbing nanocolloids is considered as a promising answer to this challenge. We report the results of experimental and theoretical study of the two-photon-assisted SRMS in Ag and ZnO nanocolloids in the nanosecond-to-picosecond pulse width domain. For 12 ns 0.527 μm laser pulses, the four-wave mixing SRMS scheme provides lasing and amplification of backscattered anti-Stokes signal in Ag nanocolloids in toluene at the threshold 0.2 mJ and the spectral shifts up to 150 MHz. For 100 ps 0.532 μm pulses, we observed for the first time efficient (over 50% in signal-to-pump ratio of pulse energies) SRMS backscattering of the anti-Stokes signal in Ag nanocolloids in toluene and predominantly Stokes signal in ZnO nanocolloids in water, with the spectral shifts up to 0.25 cm<sup>−1</sup>. We develop the first order-in-perturbation model of the four-wave mixing two-photon absorption-assisted SRMS process which shows that at nanosecond pulses, amplification is predominantly due to the thermal-induced coherent oscillations of polarization while the slow temperature wave acts also as a dynamic spatial grating which provides a self-induced optical cavity inside the interaction region. At a picosecond pulse width, according to our model, the spectral overlap between pump and signal pulses results in formation of only the dynamic spatial temperature grating, and we succeeded at recovering the linear growth of the spectral shift with the pump power near the threshold. |
| first_indexed | 2024-03-09T12:19:39Z |
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| institution | Directory Open Access Journal |
| issn | 2079-4991 |
| language | English |
| last_indexed | 2024-03-09T12:19:39Z |
| publishDate | 2022-07-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Nanomaterials |
| spelling | doaj.art-30e48e5d2a8b4717855a659a0a2ce61a2023-11-30T22:42:15ZengMDPI AGNanomaterials2079-49912022-07-011215256710.3390/nano12152567Stimulated Thermal Scattering in Two-Photon Absorbing Nanocolloids under Laser Radiation of Nanosecond-to-Picosecond Pulse WidthsAlexander I. Erokhin0Nikolay A. Bulychev1Egor V. Parkevich2Mikhail A. Medvedev3Igor V. Smetanin4P. N. Lebedev Physical Institute of RAS, Leninskii prosp. 53, 119991 Moscow, RussiaMoscow Aviation Institute, Volokolamskoe shosse 4, 125993 Moscow, RussiaP. N. Lebedev Physical Institute of RAS, Leninskii prosp. 53, 119991 Moscow, RussiaP. N. Lebedev Physical Institute of RAS, Leninskii prosp. 53, 119991 Moscow, RussiaP. N. Lebedev Physical Institute of RAS, Leninskii prosp. 53, 119991 Moscow, RussiaRecent discoveries in nonlinear optical properties of nanoparticle colloids make actual the challenge to lower the energy threshold of phase conjugation and move it into the domain of shorter pulse widths. A novel effect of the stimulated Rayleigh-Mie scattering (SRMS) in two-photon absorbing nanocolloids is considered as a promising answer to this challenge. We report the results of experimental and theoretical study of the two-photon-assisted SRMS in Ag and ZnO nanocolloids in the nanosecond-to-picosecond pulse width domain. For 12 ns 0.527 μm laser pulses, the four-wave mixing SRMS scheme provides lasing and amplification of backscattered anti-Stokes signal in Ag nanocolloids in toluene at the threshold 0.2 mJ and the spectral shifts up to 150 MHz. For 100 ps 0.532 μm pulses, we observed for the first time efficient (over 50% in signal-to-pump ratio of pulse energies) SRMS backscattering of the anti-Stokes signal in Ag nanocolloids in toluene and predominantly Stokes signal in ZnO nanocolloids in water, with the spectral shifts up to 0.25 cm<sup>−1</sup>. We develop the first order-in-perturbation model of the four-wave mixing two-photon absorption-assisted SRMS process which shows that at nanosecond pulses, amplification is predominantly due to the thermal-induced coherent oscillations of polarization while the slow temperature wave acts also as a dynamic spatial grating which provides a self-induced optical cavity inside the interaction region. At a picosecond pulse width, according to our model, the spectral overlap between pump and signal pulses results in formation of only the dynamic spatial temperature grating, and we succeeded at recovering the linear growth of the spectral shift with the pump power near the threshold.https://www.mdpi.com/2079-4991/12/15/2567nonlinear optics in nanoparticle’s colloidstimulated Rayleigh–Mie scatteringphase conjugationfour-wave mixingsynthesis of nanoparticle in plasma discharge |
| spellingShingle | Alexander I. Erokhin Nikolay A. Bulychev Egor V. Parkevich Mikhail A. Medvedev Igor V. Smetanin Stimulated Thermal Scattering in Two-Photon Absorbing Nanocolloids under Laser Radiation of Nanosecond-to-Picosecond Pulse Widths Nanomaterials nonlinear optics in nanoparticle’s colloid stimulated Rayleigh–Mie scattering phase conjugation four-wave mixing synthesis of nanoparticle in plasma discharge |
| title | Stimulated Thermal Scattering in Two-Photon Absorbing Nanocolloids under Laser Radiation of Nanosecond-to-Picosecond Pulse Widths |
| title_full | Stimulated Thermal Scattering in Two-Photon Absorbing Nanocolloids under Laser Radiation of Nanosecond-to-Picosecond Pulse Widths |
| title_fullStr | Stimulated Thermal Scattering in Two-Photon Absorbing Nanocolloids under Laser Radiation of Nanosecond-to-Picosecond Pulse Widths |
| title_full_unstemmed | Stimulated Thermal Scattering in Two-Photon Absorbing Nanocolloids under Laser Radiation of Nanosecond-to-Picosecond Pulse Widths |
| title_short | Stimulated Thermal Scattering in Two-Photon Absorbing Nanocolloids under Laser Radiation of Nanosecond-to-Picosecond Pulse Widths |
| title_sort | stimulated thermal scattering in two photon absorbing nanocolloids under laser radiation of nanosecond to picosecond pulse widths |
| topic | nonlinear optics in nanoparticle’s colloid stimulated Rayleigh–Mie scattering phase conjugation four-wave mixing synthesis of nanoparticle in plasma discharge |
| url | https://www.mdpi.com/2079-4991/12/15/2567 |
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