Ultrafast decay of femtosecond laser-induced grating in silicon-quantum-dot-based optical waveguides

I. Pelant; R. Tomašiunas; V. Sirutkaitis; J. Valenta; T. Ostatnický; K. Kůsová; R. G. Elliman

doi:10.1088/0022-3727/41/1/015103

Ultrafast decay of femtosecond laser-induced grating in silicon-quantum-dot-based optical waveguides

I. Pelant^*, R. Tomašiunas, V. Sirutkaitis, J. Valenta, T. Ostatnický, K. Kůsová, R. G. Elliman

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

2 Citations (Scopus)

Abstract

Femtosecond transient laser-induced grating (LIG) experiments were performed in planar optical waveguides made of luminescent silicon quantum dots. The LIG was created by interference of two pulses from the frequency-doubled output of a Ti-sapphire laser (400 nm, 400 fs, 1 kHz). The LIG exhibits an extremely fast decay in time (several picoseconds) that was found to decrease with decreasing grating period. The standard models based on lateral carrier diffusion cannot explain this observation (this procedure yields an unrealistically high diffusion constant of 420 cm² s^-1). Instead, the results are explained by exciton diffusion and/or enhanced exciton radiative decay rate in a cavity represented by the periodically modulated planar waveguide (Purcell effect).

Original language	English
Article number	015103
Journal	Journal Physics D: Applied Physics
Volume	41
Issue number	1
DOIs	https://doi.org/10.1088/0022-3727/41/1/015103
Publication status	Published - 7 Jan 2008

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title = "Ultrafast decay of femtosecond laser-induced grating in silicon-quantum-dot-based optical waveguides",

abstract = "Femtosecond transient laser-induced grating (LIG) experiments were performed in planar optical waveguides made of luminescent silicon quantum dots. The LIG was created by interference of two pulses from the frequency-doubled output of a Ti-sapphire laser (400 nm, 400 fs, 1 kHz). The LIG exhibits an extremely fast decay in time (several picoseconds) that was found to decrease with decreasing grating period. The standard models based on lateral carrier diffusion cannot explain this observation (this procedure yields an unrealistically high diffusion constant of 420 cm2 s-1). Instead, the results are explained by exciton diffusion and/or enhanced exciton radiative decay rate in a cavity represented by the periodically modulated planar waveguide (Purcell effect).",

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AU - Pelant, I.

AU - Tomašiunas, R.

AU - Sirutkaitis, V.

AU - Valenta, J.

AU - Ostatnický, T.

AU - Kůsová, K.

AU - Elliman, R. G.

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AB - Femtosecond transient laser-induced grating (LIG) experiments were performed in planar optical waveguides made of luminescent silicon quantum dots. The LIG was created by interference of two pulses from the frequency-doubled output of a Ti-sapphire laser (400 nm, 400 fs, 1 kHz). The LIG exhibits an extremely fast decay in time (several picoseconds) that was found to decrease with decreasing grating period. The standard models based on lateral carrier diffusion cannot explain this observation (this procedure yields an unrealistically high diffusion constant of 420 cm2 s-1). Instead, the results are explained by exciton diffusion and/or enhanced exciton radiative decay rate in a cavity represented by the periodically modulated planar waveguide (Purcell effect).

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Ultrafast decay of femtosecond laser-induced grating in silicon-quantum-dot-based optical waveguides

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