Abstract
Recent innovative applications in disordered photonics would strongly benefit from the possibility to achieve spectral tuning of the individual disorder localized photonic modes without affecting their spatial distributions. Here, we design and fabricate a two-dimensional disordered photonic system, made of a GaAs slab patterned with randomly distributed circular air scattering centers, supporting localized light modes with very small modal volume. The photoluminescence of InAs quantum dots embedded in the slab is used as a probe for near field experiments and gives direct access to the electric field intensity distribution of the localized random modes. We demonstrate that laser assisted oxidation of the GaAs slab performed by near field illumination can be used for a gentle tuning of the individual random modes without modifying the subtle balance leading to light localization given by multiple scattering.
Highlights
Spatial steadiness of individual disorder modes upon controlled spectral tuning Niccolò Caselli,1,2,a Francesco Riboli,[3] Francesca Intonti,[1,2] Federico La China,[1,2] Francesco Biccari,[1,2] Annamaria Gerardino,[4] and Massimo Gurioli1,2 1European Laboratory for Nonlinear Spectroscopy, via Nello Carrara 1, I-50019 Sesto Fiorentino, FI, Italy 2Department of Physics, University of Florence, via Sansone 1, I-50019 Sesto Fiorentino, FI, Italy 3Department of Physics, University of Trento, via Sommarive 14, I-38123 Povo, TN, Italy 4Institute of Photonics and Nanotechnology, CNR, I-00156 Roma, Italy (Received 4 December 2015; accepted 3 April 2016; published online 27 June 2016)
Recent innovative applications in disordered photonics would strongly benefit from the possibility to achieve spectral tuning of the individual disorder localized photonic modes without affecting their spatial distributions
We demonstrate that laser assisted oxidation of the GaAs slab performed by near field illumination can be used for a gentle tuning of the individual random modes without modifying the subtle balance leading to light localization given by multiple scattering
Summary
Recent innovative applications in disordered photonics would strongly benefit from the possibility to achieve spectral tuning of the individual disorder localized photonic modes without affecting their spatial distributions.
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