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Title

All-optical radio-frequency modulation of Anderson-localized modes

AuthorsArregui, Guillermo CSIC ORCID; Navarro-Urrios, D. CSIC ORCID CVN; Kehagias, N. CSIC ORCID; Sotomayor Torres, C. M. CSIC ORCID; Garcia, Pedro David
Issue Date2018
PublisherAmerican Physical Society
CitationPhysical Review B 98(18): 180202(R) (2018)
AbstractAll-optical modulation of light relies on exploiting intrinsic material nonlinearities [V. R. Almeida et al., Nature 431, 1081 (2004)]. However, this optical control is rather challenging due to the weak dependence of the refractive index and absorption coefficients on the concentration of free carriers in standard semiconductors [R. A. Soref and B. R. Bennett, Proc. SPIE 704, 32 (1987)]. To overcome this limitation, resonant structures with high spatial and spectral confinement are carefully designed to enhance the stored electromagnetic energy, thereby requiring lower excitation power to achieve significant nonlinear effects [K. Nozaki et al., Nat. Photonics 4, 477 (2010)]. Small mode-volume and high-quality (Q)-factor cavities also offer an efficient coherent control of the light field and the targeted optical properties. Here, we report on optical resonances reaching Q∼105 induced by disorder on photonic/phononic-crystal waveguides. At relatively low excitation powers (below 1mW), these cavities exhibit nonlinear effects leading to periodic (up to ∼35 MHz) oscillations of their resonant wavelength. Our system represents a test bed to study the interplay between structural complexity and material nonlinearities and their impact on localization phenomena and introduces a different functionality to the toolset of disordered photonics.
Publisher version (URL)https://doi.org/https://doi.org/10.1103/PhysRevB.98.180202
URIhttp://hdl.handle.net/10261/199026
DOI10.1103/PhysRevB.98.180202
ISSN2469-9950
E-ISSN2469-9969
Appears in Collections:(CIN2) Artículos

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