期刊
ACS NANO
卷 9, 期 12, 页码 11582-11588出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsnano.5b05419
关键词
plasmon nanolaser; spaser; plasmonic crystals; unidirectional emission; template stripping; wavelength tunability
类别
资金
- National Science Foundation (NSF) [DMR-1306514, DMR-1121262]
- Ryan Fellowship
- Northwestern University International Institute for Nanotechnology
- Department of Defense, Air Force Office of Scientific Research, National Defense Science and Engineering Graduate (NDSEG) Fellowship [32 CFR 168a]
- State of Illinois and Northwestern University
- MRSEC program at the Materials Research Center of the National Science Foundation [NSF DMR-1121262]
- Nanoscale Science and Engineering Center of the National Science Foundation [EEC-0118025/003]
- State of Illinois
- Northwestern University
- Office of the Provost
- Office for Research
- Northwestern University Information Technology
- [FA9550-11-C-0028]
- Direct For Mathematical & Physical Scien
- Division Of Materials Research [1306514] Funding Source: National Science Foundation
Plasmon lasers support cavity structures with sizes below that of the diffraction limit. However, most plasmon-based lasers show bidirectional lasing emission or emission with limited far-field directionality and large radiative losses. Here, we report unidirectional lasing from ultrasmooth, template-stripped two-dimensional (2D) plasmonic crystals. Optically pumped 20 plasmonic crystals (Au or Ag) surrounded by dye molecules exhibited lasing in a single emission direction and their lasing wavelength could be tuned by modulating the dielectric environment. We found that 20 plasmonic crystals were an ideal architecture to screen how nanocavity unit-cell structure, metal material, and gain media affected the lasing response. We discovered that template-stripped strong plasmonic materials with cylindrical posts were an optimal cavity design for a unidirectional laser operating at room temperature.
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