A suspended metasurface achieves complete light absorption: a 50 nm-thick optical nanomicrophone

Abstract

<p>A compact absorber composed of an optical cavity with an ultrathin dielectric metasurface, which can detect ultrasonic signals with extreme sensitivity.</p>

Low threshold optomechanically induced bistability based on suspended metasurface

“…The numerical calculation shows that the low-threshold bistability can be achieved at intensity levels of several W/cm -2 . Previous studies have demonstrated that such suspended metasurfaces can be realized in the practical fabrication processes [18,19], and hence the structure in this work is quite achievable experimentally. In addition, since the displacement of the suspended metasurface is caused by its own deformation, there is no excessive requirement for support structure and the flatness of the movable mirror compared to conventional macroscopic optomechanical cavities [8][9][10].…”

“…Silicon nitride membranes with excellent optical and mechanical properties are ideal materials for achieving such suspended metasurfaces and have been applied in sensitive detection. [18,19] However, for unpatterned silicon nitride membranes, while the ultra-thin thickness reduces their weight and increases sensitivity, the extremely low thickness also causes them to become more transparent, making the reflectivity reduced. To overcome this contradiction, by patterning the membrane with metasurface with designed periodic structure, the silicon nitride membrane can achieve high reflectivity around a certain wavelength while maintaining the mechanical sensitivity [20].…”

Spatial Nonreciprocal Transmission and Optical Bistability Based on Millimeter‐Scale Suspended Metasurface

“…[ 33–39 ] Integrated with metasurfaces, the Si 3 N 4 membranes can achieve high reflectivity at ultra‐thin thicknesses while maintaining mechanical stiffness. [ 27,40,41 ]…”

“…[33][34][35][36][37][38][39] Integrated with metasurfaces, the Si 3 N 4 membranes can achieve high reflectivity at ultra-thin thicknesses while maintaining mechanical stiffness. [27,40,41] In this work, we design and fabricate a millimeter-scaled Si 3 N 4 suspended metasurface with a thickness of only about 110 nm and a reflectivity of about 98.1%. The suspended metasurface is combined with a fixed mirror to form an When light interacts with microscopic objects at the micro-and nano-scale, the momentum exchange between photons and objects can be very significant.…”