期刊
ACS PHOTONICS
卷 4, 期 3, 页码 606-612出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsphotonics.6b00955
关键词
metasurface; titanium nitride; surface plasmon; evolutionary algorithm; flat optics
类别
资金
- Air Force Research laboratory [FA8650-15-2-5518]
- Air Force Office of Scientific Research (AFOSR) [FA9S50-14-1-0274]
- Soft and Hybrid Nanotechnology Experimental (SHyNE) Resource (NSF) [NNCI-154220S]
- MRSEC program (NSF) at the Materials Research Center [DMR-1121262]
- International Institute for Nanotechnology (IIN)
- Keck Foundation
- State of Illinois, through the IIN
- Office of the Provost
- Office for Research
- Northwestern University Information Technology
- Quest high performance computing facility at Northwestern University
This paper describes the design and prototyping of single-crystalline TiN plasmonic metasurfaces based on subwavelength hole arrays. An evolutionary algorithm with a multiobjective fitness function was developed to produce a variety of threedimensional (3D) light profiles with balanced intensities at the light spots. We also demonstrated a simple, efficient technique to prototype these lattice designs in large-area TiN films by combining focused ion beam milling and wet chemical etching. Multilevel phase control was achieved by tuning nanohole size, and multipoint focusing with arbitrary light spot patterns was realized. Using anisotropic nanohole shapes, the TiN lattice lenses could exhibit dynamic tuning of the focal profiles by changing the polarization of incident light.
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