|approved||nonlinearities_and_topological_transitions_metasurfaces.pdf||2015-03-11 19:06:05||J. Sebastian Gomez-Diaz|
Author: J. Sebastian Gomez-Diaz
Requested Type: Pre-Selected Invited
Submitted: 2015-03-11 09:54:41
Co-authors: M. Tymchenko, J. Lee, M. A. Belkin, and A. Alù
The University of Texas at Austin
Austin, Texas 78712
Engineered metasurfaces are planar ultrathin structures composed of subwavelength resonant inclusions. They have recently attracted great interest due to their unusual optical response, leading to novel and exciting applications, such as the generation of arbitrary beams and holograms, lenses able to control the features of reflected and transmitted light, waveguides, and reconfigurable optical antennas. Here, we present our latest research efforts in this area. First, we explore non-linear metasurfaces based on combining the field enhancement provided by plasmonic resonances with quantum-engineered intersubband transitions in semiconductor heterostructures. Several non-linear processes are considered, including second harmonic generation, differential frequency generation, and phase conjugation. In all cases, the proposed technology provides unprecedented non-linear response from planar structures, founding the basis of a novel nonlinear optics paradigm over flat surfaces. Second, we investigate hyperbolic and conductivity-near zero metasurfaces. The proposed structures, which may be realized by properly patterning a graphene monolayer, support confined surface plasmons propagating along extremely narrow directions within the sheet, while allowing a large degree of control and tunability of their propagation features. Several applications are envisioned, including hyperlenses, electrically tunable 1D waveguides over 2D surfaces, and a large local increase of light-matter interactions.
Overlapping categories: 2, 4 and 5.