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Optics Letters

Optics Letters


  • Editor: Alan E. Willner
  • Vol. 38, Iss. 18 — Sep. 15, 2013
  • pp: 3562–3565

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

F. Ramiro-Manzano, N. Prtljaga, L. Pavesi, G. Pucker, and M. Ghulinyan  »View Author Affiliations

Optics Letters, Vol. 38, Issue 18, pp. 3562-3565 (2013)

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We report on the observation of optical bistability in an integrated planar microresonator with embedded 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/dT2.92×105K1, 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, a 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 minute 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.

© 2013 Optical Society of America

OCIS Codes
(190.1450) Nonlinear optics : Bistability
(230.4320) Optical devices : Nonlinear optical devices
(230.5750) Optical devices : Resonators

ToC Category:
Optical Devices

Original Manuscript: June 20, 2013
Revised Manuscript: August 17, 2013
Manuscript Accepted: August 17, 2013
Published: September 6, 2013

F. Ramiro-Manzano, N. Prtljaga, L. Pavesi, G. Pucker, and M. Ghulinyan, "Thermo-optical bistability with Si nanocrystals in a whispering gallery mode resonator," Opt. Lett. 38, 3562-3565 (2013)

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Fig. 1. Fig. 2. Fig. 3.

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