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Publication - Journal Article

Optics Letters 38, 18, 3562-3565 (2013)
DOI: doi.org/10.1103/PhysRevE.76.050401
Link  to the article
Link to the accepted manuscript

Thermo-optical bistability with Si nanocrystals in a whispering gallery mode resonator

F. Ramiro-Manzano, N. Prtljaga, L. Pavesi, G. Pucker, and M. Ghulinyan


We report on the observation of optical bistability in an integrated planar microresonator with embed-ded silicon nanocrystals (Si-ncs). The phenomenon originates from the thermo-optical modulation of the silica-embedded Si- ncs refractive index, which in turn alters the spectral position of the resonator mode. The estimated thermo- optical coefficient of the Si nanocrystalline material, dn/dT ≈ 2.92 × 10−5 K−1, is an order of magnitude lower than that of bulk silicon. Both time-resolved pump-and-probe experiments and numerical simulations confirm that the silica host is responsible for the heat dissipation from the resonator. Moreover, negligible Q-factor degradation at pump powers as high as 100 mW along with the absence of a fast component in time resolved measurements confirm the negligible contribution from excited carriers effects. These observations, combined with the already published large third-order nonlinearities of Si-ncs (an order of magnitude larger than in bulk Si), make this system an outstanding candidate for low-power on-chip nonlinear comb generation. © 2023 Optical Society of America.


The accepted manuscript includes hysteresis curves, time-resolved experiments and simulations, along with explanatory text.


The following image is similar to the one of the accepted manuscript.
Optical instability or nonlinear hysteresis of silicon nanocrystals


Reproduced from Ref. Optics Letters 38, 18, 3562-3565 (2013)   with permission from Optica (fromer OSA)
Fernando Ramiro Manzano, PhD 
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