Complex Nano Photonics: from Physics to Device Engineering
This event is part of the Physics Department Colloquia Series.
The ability to manipulate light-matter interactions using multiscale, aperiodic electromagnetic media is at the heart of current nanoplasmonics and metamaterials technologies. Besides its fundamental interest, photonic-plasmonic coupling in complex aperiodic environments is also of great importance for a number of engineering device applications such as broadband nano-antennas, super-resolution focusing structures, complex laser nano-cavities, and optical biochemical sensors. In this talk, I will discuss selected aspects of our work on the design and engineering of field localization and resonant scattering phenomena in aperiodic metal-dielectric nanostructures with enhanced optical cross sections for light emission, energy conversion, optical sensing, and infrared detection. I will also survey recent progress towards 3D light localization in photonic devices, control of critical fractal resonances and compact localization (CL) including the engineering of Bound States in the Continuum (BIC) of open-scattering aperiodic media. In addition, I will address novel opportunities offered by the methods of fractional calculus and fractional transport equations in aperiodic photonics along with their relevance to the engineering of more efficient laser devices with reduced threshold operating in the anomalous diffusion regime. The novel concept of a “fractional random laser” will be introduced along with detailed predictions on its laser threshold and dynamical behavior. Finally, I will present our activities on the development of novel low-loss dielectrics with tunable negative permittivity from the visible to the infrared spectral range, opening new vistas towards largely scalable, multi-band plasmonic nanostructures and photonic metamaterials entirely compatible with the widespread Si technology.
1) R. Wang, F. A. Pinheiro, L. Dal Negro "Spectral statistics and scattering resonances of complex prime arrays", Phys. Rev. B, 97, 024202 (2018). 2) R. Wang, M. Rontgen, C. V. Morfonios, F. A. Pinheiro, P. Schmelcher, and L. Dal Negro, "Edgemodes of scattering chains with aperiodic order", Opt. Lett. 43, 1986-1989 (2018) 3) L. Dal Negro and S. Inampudi "Fractional Transport of Photons in Deterministic Aperiodic Structures", NGP Sci. Reports 7, 2259 (2017). 4) L. Dal Negro, R. Wang, F. Pinheiro, "Structural and Spectral Properties of Deterministic Aperiodic Optical Structures", Crystals 6, 161 (2016). 5) E. Aslan, E. Aslan, R. Wang, Mi K. Hong, S. Erramilli, M. Turkmen, Ö. G. Saraçoğlu, and Luca Dal Negro, "Multispectral Cesaro-type Fractal Plasmonic Nano-antennas", ACS Photonics 3, 2102 (2016) 6) L. Dal Negro, S. V. Boriskina, “Deterministic aperiodic nanostructures for photonics and plasmonics applications”, Laser Photonics Rev.,6, 178-218 (2012) 7) L. Dal Negro, N. Lawrence, J. Trevino, “Analytical light scattering and orbital angular momentum spectra of arbitrary Vogel spirals”, Opt. Express 20, 18209 (2012).