National Physical Laboratory

Phase-matching-free sensing with undetected light using a nonlinear thin-film metasurface

Abstract In this article, we report classical sensing with undetected light at a wavelength of 1500 nm, detected on a silicon camera at 580 nm, using four-wave mixing from a plasmonic metasurface. The bidirectional nonlinear scattering due to inherent reflections from such thin n...

Programmable Anisotropic Terahertz Permittivity via High‐Aspect‐Ratio 3D‐Printed Dielectric Mesh Networks

ABSTRACT We present a 3D‐printed anisotropic dielectric with programmable terahertz permittivity. The design embeds a mesh network of high‐aspect‐ratio void channels within a bulk substrate. The anisotropic electromagnetic response, which depends on the orientation of the void ch...

Revealing hidden nonlocality and preparation contextuality for an arbitrary input Bell inequality

Abstract In recent years, the activation of hidden nonlocality for a mixed entangled state, admitting a local model, has gained considerable interest. In this paper, we study the activation of hidden nonlocality and preparation contextuality for a class of mixed entangled states,...