An ultrabroadband 3D achromatic metalens

Nanophotonics

article

Fatih Balli¹  Mansoor A. Sultan²  Aytekin Ozdemir³  Jeffrey Todd Hastings² 

[1] University of Kentucky;Electrical and Computer Engineering, University of Kentucky;College of Optical Sciences, University of Arizona

关键词: achromat;    metalens;    nanohole;    two-photon lithography;   

DOI  :  10.1515/nanoph-2020-0550

学科分类：社会科学、人文和艺术（综合）

来源: De Gruyter

【 摘 要 】

We design and fabricate ultra-broadband achromatic metalenses operating from the visible into the short-wave infrared, 450–1700 nm, with diffraction-limited performance. A hybrid 3D architecture, which combines nanoholes with a phase plate, allows realization in low refractive index materials. As a result, two-photon lithography can be used for prototyping while molding can be used for mass production. Experimentally, a 0.27 numerical aperture (NA) metalens exhibits 60% average focusing efficiency and 6% maximum focal length error over the entire bandwidth. In addition, a 200 μm diameter, 0.04 NA metalens was used to demonstrate achromatic imaging over the same broad spectral range. These results show that 3D metalens architectures yield excellent performance even using low-refractive index materials, and that two-photon lithography can produce metalenses operating at visible wavelengths.

【 授权许可】

CC BY