PERSONAL Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.
We theoretically and experimentally demonstrate a novel design of broadband double-layer achromatic metalens working for wavelengths ranging from 400-700 nm. By exploiting a dielectric staircase layer, we significantly extended the range of attainable group delay with a library of nanoantennas with moderate shape complexity. Our experiment results show that our metalens has a Strehl ratio of >80%, and the focal length variation is less than 3% over the entire visible band, exhibiting excellent broadband achromatic focusing. Our work could shed light on overcoming the size and bandwidth limits of achromatic metalenses and facilitate applications such as microscopy and spectral imaging.
PERSONAL Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.