Scattering-amplitude modulated guided-wave-driven metalens for enhanced focusing efficiency

【摘要】 Guided-wave-driven metasurfaces enable unprecedented control over off-chip light scattering but are often limited by low efficiency. Here, we introduce a scattering-amplitude modulation strategy into guided-wave-driven metalenses to significantly enhance their out-of-plane focusing efficiency. By taking the guided-wave attenuation due to back-reflection and scattering from the meta-atoms into account, the meta-atom sizes are sequentially increased along the guided-wave propagation direction to ensure near-uniform power scattering from each element. Our scattering-amplitude modulated design achieves focusing efficiency 2.3 times that of conventional metalenses composed of uniform meta-atoms. This approach paves the way for highly efficient and uniform integrated metasurface devices critical for next-generation dense photonic circuits.更多还原

【Abstract】 Guided-wave-driven metasurfaces enable unprecedented control over off-chip light scattering but are often limited by low efficiency. Here, we introduce a scattering-amplitude modulation strategy into guided-wave-driven metalenses to significantly enhance their out-of-plane focusing efficiency. By taking the guided-wave attenuation due to back-reflection and scattering from the meta-atoms into account, the meta-atom sizes are sequentially increased along the guided-wave propagation direction to ensure near-uniform power scattering from each element. Our scattering-amplitude modulated design achieves focusing efficiency 2.3 times that of conventional metalenses composed of uniform meta-atoms. This approach paves the way for highly efficient and uniform integrated metasurface devices critical for next-generation dense photonic circuits.更多还原