Experimental observation of anharmonic effects in coherent phonon dynamics in diamond

Zukerstein, Martin; Kozák, Martin; Trojánek, F.; Malý, Pavel

doi:10.1016/j.diamond.2018.10.018

Cited by 11 publications

(5 citation statements)

References 21 publications

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“…Since the vast majority of OCs, besides free-excitonic states and A-band recombination traps [ 66 , 67 ], possess quasi-molecular energetic structure with ground and excited electronic states, equipped by the corresponding sets of vibrational levels [ 60 , 68 ], large displacements along their configuration coordinate or dampen radiative relaxation due to interstate conversion, which could result in negligible PL yield [ 69 ], requiring other characterization methods, such as electron paramagnetic resonance, to be invoked [ 70 ]. Center-symmetrical OCs allow their Raman detection via the excitation of coherent optical phonons [ 71 ]. On the other hand, non-center-symmetrical OCs could affect local second-harmonic generation inside diamonds, enabling their overall mapping [ 72 ].…”

Section: Basic Physical Processes Of Ultrashort Pulse Laser-diamond I...mentioning

confidence: 99%

“Stealth Scripts”: Ultrashort Pulse Laser Luminescent Microscale Encoding of Bulk Diamonds via Ultrafast Multi-Scale Atomistic Structural Transformations

et al. 2023

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The ultrashort-laser photoexcitation and structural modification of buried atomistic optical impurity centers in crystalline diamonds are the key enabling processes in the fabrication of ultrasensitive robust spectroscopic probes of electrical, magnetic, stress, temperature fields, and single-photon nanophotonic devices, as well as in “stealth” luminescent nano/microscale encoding in natural diamonds for their commercial tracing. Despite recent remarkable advances in ultrashort-laser predetermined generation of primitive optical centers in diamonds even on the single-center level, the underlying multi-scale basic processes, rather similar to other semiconductors and dielectrics, are almost uncovered due to the multitude of the involved multi-scale ultrafast and spatially inhomogeneous optical, electronic, thermal, and structural elementary events. We enlighten non-linear wavelength-, polarization-, intensity-, pulsewidth-, and focusing-dependent photoexcitation and energy deposition mechanisms in diamonds, coupled to the propagation of ultrashort laser pulses and ultrafast off-focus energy transport by electron–hole plasma, transient plasma- and hot-phonon-induced stress generation and the resulting variety of diverse structural atomistic modifications in the diamond lattice. Our findings pave the way for new forthcoming groundbreaking experiments and comprehensive enlightening two-temperature and/or atomistic modeling both in diamonds and other semiconductor/dielectric materials, as well as innovative technological breakthroughs in the field of single-photon source fabrication and “stealth” luminescent nano/microencoding in bulk diamonds for their commercial tracing.

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Section: Basic Physical Processes Of Ultrashort Pulse Laser-diamond I...mentioning

confidence: 99%

“Stealth Scripts”: Ultrashort Pulse Laser Luminescent Microscale Encoding of Bulk Diamonds via Ultrafast Multi-Scale Atomistic Structural Transformations

et al. 2023

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“…These picosecond effects in spectral broadening of ultrashort laser pulses and related lattice effects were recently overviewed in [19]. However, due to the positive chirping of the pulses Previously, such pulsewidth-dependent broadening of ultrashort-laser pulses was related to Kerr-like self-phase modulation and EHP screening, enhanced for the longer (picosecond) pulsewidths by the Raman-Kerr effect [18,23,24] driven by prompt phonon excitations [19,[23][24][25][26]. The two former contributions are directly driven by pulse energy/pulsewidth ratio; however, the latter, Raman-Kerr contribution induced, e.g., by prompt excitation of coherent optical phonons [25,26], could appear on a picosecond timescale as a pulsewidth-invariant energy threshold value [23].…”

Section: Effect Of Pulsewidthmentioning

confidence: 99%

“…However, due to the positive chirping of the pulses Previously, such pulsewidth-dependent broadening of ultrashort-laser pulses was related to Kerr-like self-phase modulation and EHP screening, enhanced for the longer (picosecond) pulsewidths by the Raman-Kerr effect [18,23,24] driven by prompt phonon excitations [19,[23][24][25][26]. The two former contributions are directly driven by pulse energy/pulsewidth ratio; however, the latter, Raman-Kerr contribution induced, e.g., by prompt excitation of coherent optical phonons [25,26], could appear on a picosecond timescale as a pulsewidth-invariant energy threshold value [23]. Meanwhile, at later picosecond times, such non-linear polarization related to optical phonons should be damped by anharmonic decay of optical phonons into pairs of acoustic ones via the Klemens mechanism [27], being facilitated by electron-phonon thermalization after 2-3 ps [28].…”

Section: Effect Of Pulsewidthmentioning

confidence: 99%

Periodical Ultra-Modulation of Broadened Laser Spectra in Dielectrics at Variable Ultrashort Laser Pulsewidths: Ultrafast Plasma, Plasmonic and Nanoscale Structural Effects

Kudryashov,

Danilov,

Gorevoy

et al. 2023

Photonics

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Self-phase modulation (SPM) broadening of prompt laser spectra was studied in a transmission mode in natural and synthetic diamonds at variable laser wavelengths (515 and 1030 nm), pulse energies and widths (0.3–12 ps, positively chirped pulses), providing their filamentary propagation. Besides the monotonous SPM broadening of the laser spectra versus pulse energy, which was more pronounced for the (sub)picosecond pulsewidths and more nitrogen-doped natural diamond with its intra-gap impurity states, periodical low-frequency modulation was observed in the spectra at the shorter laser pulsewidths, indicating dynamic Bragg filtering of the supercontinuum due to ultrafast plasma and nanoplasmonic effects. Damping of broadening and ultra-modulation for the longer picosecond pulsewidths was related to the thermalized electron-hole plasma regime established for the laser pulsewidths longer, than 2 ps. Unexpectedly, at higher pulse energies and corresponding longer, well-developed microfilaments, the number of low-intensity, low-frequency sideband spectral modulation features counterintuitively increases, thus indicating dynamic variation of the periods in the longitudinal plasma Bragg gratings along the filaments due to prompt secondary laser–plasmon interactions. The underlying sub- and/or near-wavelength longitudinal nanoscale Bragg gratings produced by femtosecond laser pulses in this regime could be visualized in less hard lithium niobate by atomic force microscopy cross-sectional analysis in the correlation with the corresponding sideband spectral components, supporting the anticipated Bragg filtering mechanism and envisioning the corresponding grating periods.

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“…Previously, such pulsewidth-dependent broadening of ultrashort-laser pulses was related to Kerr-like self-phase modulation and EHP screening, enhanced for the longer (picosecond) pulsewidths by Raman-Kerr effect [24,25]. The two former contributions are directly driven by pulse energy/pulsewidth ratio, however, the latter, Raman-Kerr contribution induced, e.g., by prompt excitation of coherent optical phonons [26,27], could appear on a picosecond timescale as a pulsewidth-invariant energy threshold value [21]. Meanwhile, at later picosecond times such nonlinear polarization related to optical phonons, should be damped by anharmonic decay of optical phonons into pairs of acoustic ones via the Clemens mechanism [28], being facilitated by the electronphonon thermalization after 2 -3 ps [29].…”

Section: Effect Of Pulsewidthmentioning

confidence: 99%

Periodical Ultramodulation of Broadened Laser Spectra in Diamond at Variable Ultrashort Laser Pulsewidths: Ultrafast Plasma, Plasmonic and Phonon Effects

Kudryashov,

Danilov,

Smirnov

et al. 2023

Preprint

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Self-phase modulation (SPM) broadening of laser spectra was studied in a transmission mode in natural and synthetic diamonds at variable laser wavelengths (515 and 1030 nm), pulse energies and widths (0.3 - 12 ps, positively chirped pulses), providing their filamentary propagation. Besides the monotonous SPM broadening of the laser spectra versus pulse energy, more pronounced for the (sub)picosecond pulsewiths and more doped natural diamond, periodical low-frequency modulation was observed in the spectra at the shorter laser pulsewidths, indicating dynamic Bragg filtering of the supercontinuum due to ultrafast plasma and nanoplasmonic effects. Damping of broadening and ultramodulation for the longer picosecond pulsewidths was related to thermalized electron-hole plasma regime established for the laser pulsewidths longer, than 2 ps. Unexpectedly, at higher pulse energies and corresponding longer microfilaments, the number of spectral modulation features increases, indicating dynamic variation of the periods in the longitudinal plasma Bragg gratings along the filaments due to prompt secondary laser-plasmon interactions.

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Experimental observation of anharmonic effects in coherent phonon dynamics in diamond

Cited by 11 publications

References 21 publications

“Stealth Scripts”: Ultrashort Pulse Laser Luminescent Microscale Encoding of Bulk Diamonds via Ultrafast Multi-Scale Atomistic Structural Transformations

“Stealth Scripts”: Ultrashort Pulse Laser Luminescent Microscale Encoding of Bulk Diamonds via Ultrafast Multi-Scale Atomistic Structural Transformations

Periodical Ultra-Modulation of Broadened Laser Spectra in Dielectrics at Variable Ultrashort Laser Pulsewidths: Ultrafast Plasma, Plasmonic and Nanoscale Structural Effects

Periodical Ultramodulation of Broadened Laser Spectra in Diamond at Variable Ultrashort Laser Pulsewidths: Ultrafast Plasma, Plasmonic and Phonon Effects

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