期刊
ACS PHOTONICS
卷 8, 期 6, 页码 1556-1561出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsphotonics.1c00297
关键词
titanium nitride; surface plasmon; lattice plasmon; surface lattice resonance; transient absorption; ultrafast spectroscopy
类别
资金
- Air Force Research Laboratory [FA8650-15-2-5518]
- SHyNE Resource [NSF ECCS-2025633]
- IIN
- Northwestern's MRSEC Program [NSF DMR-1720139]
- SHyNE Resource, a node of the NSF National Nanotechnology Coordinated Infrastructure [NSF ECCS-2025633]
- Office of the Provost
- Northwestern University Information Technology
- U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences [DE-AC02-06CH11357]
In this study, the differences in optical properties between TiN nanoparticles supporting surface lattice resonances (SLRs) and localized surface plasmons (LSPs) were investigated, revealing asymmetric broadening at ps-time scales in SLRs compared to symmetric peak broadening in LSPs. The TiN nanoparticle arrays showed robustness under extreme conditions, withstanding pump fluences exceeding 50 mJ/cm(2) for over half an hour with minimal change in bleach wavelength.
Titanium nitride (TiN) is an advantageous plasmonic material for optoelectronic applications that require resilience to extreme irradiation or temperatures. Although TiN is optically similar to noble metals at near-infrared wavelengths under steady-state excitation conditions, their photoexcited properties are distinct at ultrafast time scales. This paper describes the differences in optical properties between coupled TiN nanoparticles in 2D arrays that support surface lattice resonances (SLRs) and TiN nanoparticle arrays that support only localized surface plasmons (LSPs). Compared to symmetric photoinduced peak broadening in the LSPs, we found that SLRs show asymmetric broadening at ps-time scales in transient absorption measurements. Furthermore, TiN nanoparticle arrays were robust and withstood pump fluences exceeding 50 mJ/cm(2) for over half an hour with little to no change in bleach wavelength.
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