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Additive Manufacturing of a 3D Terahertz Gradient‐Refractive Index Lens
Author(s) -
Zhou Fan,
Cao Wei,
Dong Biqin,
Reissman Timothy,
Zhang Weili,
Sun Cheng
Publication year - 2016
Publication title -
advanced optical materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.89
H-Index - 91
ISSN - 2195-1071
DOI - 10.1002/adom.201600033
Subject(s) - terahertz radiation , materials science , refractive index , optics , lens (geology) , diffraction , gradient index optics , optoelectronics , dielectric , physics
A 3D terahertz gradient‐refractive index lens designed by transformation optics is achieved by fabricating “woodpile” structures with varying dimensions of subwavelength dielectric unit cells using the projection microstereolithography technique. Both simulation and experimental investigations confirm that the lens delivers an imaging resolution very close to the diffraction limit over a frequency range from 0.4 to 0.6 THz.