NONLINEAR METASURFACES BASED ON PLASMONIC RESONATORS COUPLED TO INTERSUBBAND TRANSITIONS

摘要

A nonlinear metasurface structure including a multi-quantum-well layer designed for a nonlinear response for a desired nonlinear optical process and an array of nanoantennas coupled to the intersubband transitions of the multi-quantum-well layer. Each nanoantenna in the array is designed to have electromagnetic resonances at or close to all input and output frequencies of a given nonlinear optical process. Nanoantennas allow efficient coupling of any incident and outgoing light polarizations to intersubband transitions. Nanoantennas may further provide significant field enhancement in the multi-quantum-well layer. As a result, the nonlinear metasurface structure can be designed to produce a highly nonlinear response for any polarization and angle of incidence of incoming and outgoing waves in a nonlinear optical process. Due to their very larger nonlinear response, efficient frequency conversion can be produced in these metasurfaces without the stringent phase-matching constraints of bulk nonlinear crystals.

主权项

1. A nonlinear metasurface structure, comprising:
a multi-quantum-well layer designed for a nonlinear response associated with intersubband transitions in said multi-quantum-well layer for a nonlinear optical process; and one or more arrays of nanoantennas located on top and/or below said multi-quantum-well layer with their electromagnetic resonances coupled to said intersubband transitions of said multi-quantum-well layer, wherein said nanoantennas in said one or more arrays of nanoantennas have resonances approximately equal to input and/or output frequencies of said nonlinear optical process.