Abstract
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/cm2 for over half an hour with little to no change in bleach wavelength.
| Original language | English (US) |
|---|---|
| Pages (from-to) | 1556-1561 |
| Number of pages | 6 |
| Journal | ACS Photonics |
| Volume | 8 |
| Issue number | 6 |
| DOIs | |
| State | Published - Jun 16 2021 |
Funding
This material is based on research sponsored by the Air Force Research Laboratory under Agreement Number FA8650-15-2-5518. The U.S. Government is authorized to reproduce and distribute reprints for Governmental purposes notwithstanding any copyright notation thereon. The views and conclusions contained herein are those of the authors and should not be interpreted as necessarily representing the official policies or endorsements, either expressed or implied, of Air Force Research Laboratory or the U.S. Government. This work made use of the NUFAB, EPIC, and SPID facilities of Northwestern University’s NUANCE Center, which has received support from the SHyNE Resource (NSF ECCS-2025633), the IIN, and Northwestern’s MRSEC Program (NSF DMR-1720139). This work also made use of the Pritzker Nanofabrication Facility, which receives partial support from the SHyNE Resource, a node of the NSF National Nanotechnology Coordinated Infrastructure (NSF ECCS-2025633). This research was also supported in part by computational resources and staff contributions provided for the Quest High Performance Computing Facility at Northwestern University, which is jointly supported by the Office of the Provost, the Office for Research, and Northwestern University Information Technology. Use of the Center for Nanoscale Materials, an Office of Science user facility, was supported by the U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences, under Contract No. DE-AC02-06CH11357.
Keywords
- lattice plasmon
- surface lattice resonance
- surface plasmon
- titanium nitride
- transient absorption
- ultrafast spectroscopy
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Biotechnology
- Atomic and Molecular Physics, and Optics
- Electrical and Electronic Engineering