High efficiency, high quality factor active membrane metasurfaces with extended Kerker effect

TL;DR

This paper presents a novel metasurface design leveraging the extended Kerker effect and quasi-bound states in the continuum to achieve high-efficiency, narrow-linewidth beam deflection with robust tolerance and low power consumption.

Contribution

It introduces the extended Kerker effect paradigm combined with q-BICs for improved metasurface performance, demonstrating a highly efficient beam deflector with exceptional spectral and spatial properties.

Findings

Beam deflection efficiency exceeds 92%

Spectral linewidth of 4 GHz and quality factor of 114

94% transmission modulation at low pump intensity

Abstract

Efficient, low-power, and highly integrated optoelectronic devices remain a critical yet challenging goal.Here, we introduce the extended Kerker effect paradigm that synergizes Kerker's condition with quasi-bound states in the continuum (q-BICs) to overcome these limitations. By engineering dual-mode dispersion, we achieve a high efficiency beam deflector using a membrane metasurface, simultaneously realizing robust parameter tolerance and narrow-linewidth resonances-two typically conflicting properties.Our experiment demonstrates an absolute beam deflection efficiency exceeding 92%, with exceptional spectral and spatial selectivity, including a 4 GHz linewidth, a 2.8o divergence angle, and a quality factor of 114. Additionally, it enables 94% transmission intensity modulation at a pump intensity as low as 0.5 W/cm2 in experiments. The extended Kerker effect provides a scalable platform for energy-efficient and integrable optoelectronic devices, paving the way for transformative advancements in next-generation wireless communications and LiDAR.