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Title: Ultraslow Anomalous Photon Diffusion in Aperiodic Complex Media

Participants: Professor Luca Dal Negro

Background: Stochastic models of the transport of photons through disordered media suggest that it is possible to create photonic materials that support ultra-slow diffusion of light, known as Sinai sub-diffusion. In disordered lattices, these stochastic processes are non-Markovian due to the effect of long-range correlations, and photon diffusion is significantly slowed down.

Description: This projects looks at the design and demonstration of complex photonic media with ultraslow photonic sub-diffusion over broad frequency spectra. Characterizing the relationship between disorder and anomalous transport will allow for the engineering of novel materials whose transport properties can be actively tuned. Such precise control of the photon transport characteristics has not yet been demonstrated and will offer profound advancements in the ability to develop novel optical devices such as optical buffers for solar and on-chip energy harvesting applications.

An electromagnetic dipole pulse diffusing through (top row) a random nanostructure array and (bottom row) a homogeneous medium. The slowed diffusion of the electromagnetic field is evident in the random nanostructured medium compared to the homogeneous environment.

An electromagnetic dipole pulse diffusing through (top row) a random nanostructure array and (bottom row) a homogeneous medium. The slowed diffusion of the electromagnetic field is evident in the random nanostructured medium compared to the homogeneous environment.

Website: www.bu.edu/nano

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