期刊
ACS PHOTONICS
卷 6, 期 2, 页码 322-326出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsphotonics.8b01541
关键词
lattice plasmon resonance; surface lattice resonance; out-of-plane charge oscillations; nanograting; Fano resonance
类别
资金
- Vannevar Bush Faculty Fellowship from DOD [N00014-17-1-3023]
- Soft and Hybrid Nanotechnology Experimental (SHyNE) Resource [NSF ECCS-1542205]
- Materials Research Science and Engineering Center [DMR-1720139]
- State of Illinois
- Northwestern University
- Office of the Provost
- Office for Research
- Northwestern University Information Technology
Lattice plasmon resonances or surface lattice resonances (SLRs) supported in two-dimensional (2D) metal nanoparticle arrays have extremely narrow line widths and highly localized electric field enhancements, which are key properties for realizing plasmon lasers and hybrid solid-state lighting devices. This paper reports lattice plasmons in one-dimensional (1D) metal nanogratings with broadband tunability (over 400 nm) far beyond their 2D counterparts at visible wavelengths. The large wavelength tunabilities of 1D or line-SLRs are from the lower symmetry of the structures compared to 2D arrays based on nanoparticles. We demonstrate that line-SLRs exhibit a Fano-like character based on coupling between an out-of-plane plasmon excitation and 1D Bragg diffraction modes. We show how the height and periodicity of the grating determine the spectral properties of the line-SLRs. By adjusting the line height, we achieved high-quality lattice resonances, even in index-mismatched environments.
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