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Title: Linear and Nonlinear Optical Properties of Iridium Nanoparticles Grown via Atomic Layer Deposition

Journal Article · · Coatings
ORCiD logo [1]; ORCiD logo [1];  [2];  [2]; ORCiD logo [3]; ORCiD logo [3];  [4];  [4];  [1];  [5];  [4];  [1]; ORCiD logo [1]
  1. Fraunhofer Institute for Applied Optics and Precision Engineering (IOF) (Germany); Friedrich Schiller Univ., Jena (Germany)
  2. Ludwig Maximilian Univ. of Munich, Munich (Germany); Max Planck Society, Garching (Germany). Max Planck Institute of Quantum Optics
  3. Friedrich Schiller Univ., Jena (Germany)
  4. Fraunhofer Institute for Applied Optics and Precision Engineering (IOF) (Germany)
  5. Ludwig Maximilian Univ. of Munich, Munich (Germany); Max Planck Society, Garching (Germany). Max Planck Institute of Quantum Optics; SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States); Stanford Univ., CA (United States)

Nonlinear optical phenomena enable novel photonic and optoelectronic applications. Especially, metallic nanoparticles and thin films with nonlinear optical properties offer the potential for micro-optical system integration. For this purpose, new nonlinear materials need to be continuously identified, investigated, and utilized for nonlinear optical applications. While noble-metal nanoparticles, nanostructures, and thin films of silver and gold have been widely studied, iridium (Ir) nanoparticles and ultrathin films have not been investigated for nonlinear optical applications yet. Here, we present a combined theoretical and experimental study on the linear and nonlinear optical properties of iridium nanoparticles deposited via atomic layer deposition (ALD). Linear optical constants, such as the effective refractive index and extinction coefficient, were evaluated at different growth stages of nanoparticle formation. Both linear and nonlinear optical properties of these Ir ALD coatings were calculated theoretically using the Maxwell Garnett theory. The third-order susceptibility of iridium nanoparticle samples was experimentally investigated using the z-scan technique. According to the experiment, for an Ir ALD coating with 45 cycles resulting in iridium nanoparticles, the experimentally determined nonlinear third-order susceptibility is about χIr(3) = (2.4 – i2.1) × 10–17 m2/V2 at the fundamental wavelength of 700 nm. The theory fitted to the experimental results predicts a 5 × 106-fold increase around 230 nm. This strong increase is due to the proximity to the Mie resonance of iridium nanoparticles.

Research Organization:
SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States). Linac Coherent Light Source (LCLS)
Sponsoring Organization:
USDOE Office of Science (SC)
Grant/Contract Number:
AC02-76SF00515
OSTI ID:
1991602
Journal Information:
Coatings, Vol. 13, Issue 4; ISSN 2079-6412
Publisher:
MDPICopyright Statement
Country of Publication:
United States
Language:
English

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