Transient absorption and higher-order nonlinearities in silver nanoplatelets

Jayabalan, J.; Singh, Asha; Chari, Rama; Khan, S.; Srivastava, Himanshu; Oak, S. M.

doi:10.1063/1.3125244

Cited by 19 publications

(15 citation statements)

References 17 publications

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“…Since the measurement of third-, fifth-, and seventh-order nonlinearities of silver nanoplatelet colloids using a femtosecond laser [26], an extension of nonlinear Schrödinger equation including the cubic-quintic-septic nonlinearity was used to model the propagation of spatial solitons. In [27], for example, the authors performed numerical calculations based on higher-order nonlinearity parameters including seventh-order susceptibility χ 7 ðÞ (a chalcogenide glass is an example).…”

Section: Introductionmentioning

confidence: 99%

Bright, Dark, and Kink Solitary Waves in a Cubic-Quintic-Septic-Nonical Medium

Youssoufa¹,

Dafounansou²,

Mohamadou³

2021

Nonlinear Optics - From Solitons to Similaritons

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In this chapter, evolution of light beams in a cubic-quintic-septic-nonical medium is investigated. As the model equation, an extended form of the well-known nonlinear Schrödinger (NLS) equation is taken into account. By the use of a special ansatz, exact analytical solutions describing bright/dark and kink solitons are constructed. The existence of the wave solutions is discussed in a parameter regime. Moreover, the stability properties of the obtained solutions are investigated, and by employing Stuart and DiPrima’s stability analysis method, an analytical expression for the modulational stability is found.

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Section: Introductionmentioning

confidence: 99%

Bright, Dark, and Kink Solitary Waves in a Cubic-Quintic-Septic-Nonical Medium

Youssoufa¹,

Dafounansou²,

Mohamadou³

2021

Nonlinear Optics - From Solitons to Similaritons

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“…Such variations can lead to deviation in the measurement of the true optical response of the sample. Further, in many samples the decay time also depends on the excited carrier density and hence the pump power [21][22][23]. In such cases averaging over large number of data with larger deviation in pump power would result in a wrong estimation for the response time.…”

Section: Introductionmentioning

confidence: 99%

“…When the sample is excited by the pump pulse its optical response changes. For sufficiently small excitation conditions, the change in the absorption coefficient will be proportional to the third-order nonlinear absorption coefficient [2,22]. Consider an instantaneously responding sample having a relaxation time much longer than the pulse width, the absorption coefficient after excitation by the pump pulse can be written as,…”

Section: Introductionmentioning

confidence: 99%

“…Typical PDs which has microsecond response times will give a DC output when irradiated with output of such high repetition rate lasers. By chopping the pump beam at few kHz, which is well away from the laser repetition rate and normal sources of noises, a good signal to noise ratio for the transient measurement could be obtained [22,26]. As mentioned in the introduction, many samples need higher pump pulse energies for generating sufficient change in probe as well as long pulse to pulse separation for providing sufficient time for the sample to relax.…”

Section: Introductionmentioning

confidence: 99%

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Filtering Noise in Time and Frequency Domain for Ultrafast Pump-Probe Performed Using Low Repetition Rate Lasers

Khatua¹,

Gurung²,

Singh³

et al. 2020

Preprint

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Optical pump-probe spectroscopy is a powerful tool to directly probe the carrier dynamics in materials down to sub-femtosecond resolution. To perform such measurement, while keeping the pump induced perturbation to the sample as small as possible, it is essential to have a detection scheme with high signal to noise ratio. Achieving such high signal to noise ratio is easy with phase sensitive detection based on lock-in-amplifier when a high repetition rate laser is used as the optical pulse source. However such a lockin-amplifier based method does not work well when a low repetition rate laser is used for the measurement.In this article, a sensitive detection scheme which combines the advantages of boxcar which rejects noise in time domain and lock-in-amplifier which isolates signal in frequency domain for performing pump-probe measurements using low-repetition rate laser system is proposed and experimentally demonstrated. A theoretical model to explain the process of signal detection and a method to reduce the pulse to pulse energy fluctuation in probe pulses is presented. By performing pump-probe measurements at various detection conditions the optimum condition required for obtaining transient absorption signal with low noise is presented. The reported technique is not limited to pump-probe measurements and can be easily modified to suite for other sensitive measurements at low-repetition rates.

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“…[13][14][15] Such transient measurements can throw some light on the origin and time response of the optical nonlinearity. In pump-probe experiments on silver nanoplatelet water colloids, the nonlinear response was observed to peak a few hundred fs after the peak of the 100 fs excitation pulse.…”

Section: Introductionmentioning

confidence: 99%

Third-order nonlinearity of metal nanoparticles: Isolation of instantaneous and delayed contributions

Jayabalan

Singh

Khan

et al. 2012

Journal of Applied Physics

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Measurement of transient absorption of a sample allows estimation of the evolution of the nonlinear response of materials after excitation by a short pump pulse. In this work, the time dependent nonlinear response of silver nanoplatelets in water was measured using transient absorption technique for various volume fractions of silver in water. These measurements were carried out in subpicosecond time scales and a suitable theoretical model was developed. It is been shown that the hot-electron contribution to the third-order nonlinearity of metal colloids is much higher than its instantaneous third-order nonlinearity. At low volume fractions, the delayed hot-electron contribution to third-order nonlinearity increases linearly with the volume fraction.

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Transient absorption and higher-order nonlinearities in silver nanoplatelets

Cited by 19 publications

References 17 publications

Bright, Dark, and Kink Solitary Waves in a Cubic-Quintic-Septic-Nonical Medium

Bright, Dark, and Kink Solitary Waves in a Cubic-Quintic-Septic-Nonical Medium

Filtering Noise in Time and Frequency Domain for Ultrafast Pump-Probe Performed Using Low Repetition Rate Lasers

Third-order nonlinearity of metal nanoparticles: Isolation of instantaneous and delayed contributions

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