Coherent power amplification of third-order harmonic femtosecond pulses at thin-film up-conversion nanoparticlesopen access
- Authors
- Gao, Y[Gao, Yi]; Lee, H[Lee, Hyub]; Xu, W[Xu, Wen]; Jiao, JN[Jiao, Jiannan]; Chen, P[Chen, Peng]; Kim, DH[Kim, Dong-Hwan]; Kim, YJ[Kim, Young-Jin]
- Issue Date
- 25-Mar-2019
- Publisher
- NATURE PUBLISHING GROUP
- Citation
- SCIENTIFIC REPORTS, v.9, no.1
- Indexed
- SCIE
SCOPUS
- Journal Title
- SCIENTIFIC REPORTS
- Volume
- 9
- Number
- 1
- URI
- https://scholarworks.bwise.kr/skku/handle/2021.sw.skku/10442
- DOI
- 10.1038/s41598-019-41591-6
- ISSN
- 2045-2322
- Abstract
- Third harmonic generation (THG) is a nonlinear optical process attractive in high-resolution interfacial studies, sub-wavelength light manipulation, and bio-molecular detection due to its capability of converting low-energy quanta into a quantum of a higher energy. One of the limitations in utilizing THG is its low power conversion efficiency; thus, various THG enhancement methods have been researched by involving plasmonic coupling effects or utilizing electric band gap resonances at quantum dots or two-dimensional materials. Meanwhile, lanthanide ion-doped up-conversion nanoparticles (UCNPs) can be excited by a multi-photon process similar to THG, but its interaction or resonance with THG has not been studied to date. In this Communication, we demonstrate the first coherent amplification of third-order harmonic femtosecond pulses at multi-layered UCNP thin-film with an amplification factor of 7.8. This amplification is made by the resonance interaction of incident femtosecond laser field, generated third-order harmonics, and the electric band gaps of UCNPs. The power contribution of the third-order harmonic and the up-conversion luminescence (UCL) is strongly dependent on the sample geometry due to the reabsorption effect. For in-depth understanding of the emission characteristics, spectral-domain, time-domain, radio-frequency (RF) domain, and polarization-dependence analysis were addressed. This coherent amplification of third harmonic (TH) at UCNP thin-films enables us to attain higher power, shorter wavelength, and ultra-short femtosecond pulses generated from a simple thin-film structure near to the target samples, which will pave a way to an ultrafast short-wavelength laser platform for material characterization, sub-wavelength photonics, and biomolecular detection.
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Collections - Engineering > Chemical Engineering > 1. Journal Articles
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