Lattice Resonances of Nanohole Arrays for Quantum Enhanced Sensing

Periodic arrays of nanoholes perforated in metallic thin films interact strongly with light and produce large electromagnetic near-field enhancements their vicinity. As a result, the optical response these systems is very sensitive to changes dielectric environment, thus making them an exceptional platform for development compact sensors. Given that already operate at shot-noise limit when used as sensors, sensing capabilities can be enhanced beyond this by probing quantum light, such squeezed or entangled states. Motivated goal, here, we present comparative theoretical analysis nanohole one two holes per unit cell. Through detailed investigation response, find two-hole array supports resonances are narrower stronger than its one-hole counterpart, therefore have higher fundamental sensitivity defined Cram\'er-Rao bound. We validate analyzed experimental measurements reflectance representative samples. The results work advance our understanding pave way developing platforms capable taking full advantage resources offered states light.