Details
| Original language | English |
|---|---|
| Pages (from-to) | 1655-1661 |
| Number of pages | 7 |
| Journal | ACS PHOTONICS |
| Volume | 7 |
| Issue number | 7 |
| Early online date | 16 Jun 2020 |
| Publication status | Published - 15 Jul 2020 |
Abstract
Nanoantennas made of high-index semiconductors with a strong nonlinearity and supported optical Mie-type resonances offer a promising alternative platform for nonlinear nanophotonics. In this Letter, we employ an array of amorphous silicon nanodisks with varying diameters to produce a broadband deep-ultraviolet third harmonic of a few-cycle Ti:sapphire oscillator. Ultrashort light pulses efficiently deposit their energy at the center of the disks where the electric field is strongly amplified by the anapole states. This leads to a progressive material modification in an extreme multishot (>1010 pulses) and a rather low fluence (<10-3 J/cm2) regime, drastically differing from other known mechanisms, such as nonthermal plasma annealing or thermal melting-induced recrystallization. We suggest that the material modification is due to femtosecond laser-induced excitation of dangling bonds, which leads to a gradual boosting of the third harmonic conversion efficiency and broadening of its spectral bandwidth.
Keywords
- all-dielectric nanoantennas, anapole mode, deep-ultraviolet, few-cycle laser, silicon photonics, third harmonic generation, ultrafast nonlinear optics
ASJC Scopus subject areas
- Materials Science(all)
- Electronic, Optical and Magnetic Materials
- Biochemistry, Genetics and Molecular Biology(all)
- Biotechnology
- Physics and Astronomy(all)
- Atomic and Molecular Physics, and Optics
- Engineering(all)
- Electrical and Electronic Engineering
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In: ACS PHOTONICS, Vol. 7, No. 7, 15.07.2020, p. 1655-1661.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Progressive Self-Boosting Anapole-Enhanced Deep-Ultraviolet Third Harmonic during Few-Cycle Laser Radiation
AU - Shi, Liping
AU - Evlyukhin, Andrey B.
AU - Reinhardt, Carsten
AU - Babushkin, Ihar
AU - Zenin, Vladimir A.
AU - Burger, Sven
AU - Malureanu, Radu
AU - Chichkov, Boris N.
AU - Morgner, Uwe
AU - Kovacev, Milutin
N1 - Publisher Copyright: Copyright © 2020 American Chemical Society.
PY - 2020/7/15
Y1 - 2020/7/15
N2 - Nanoantennas made of high-index semiconductors with a strong nonlinearity and supported optical Mie-type resonances offer a promising alternative platform for nonlinear nanophotonics. In this Letter, we employ an array of amorphous silicon nanodisks with varying diameters to produce a broadband deep-ultraviolet third harmonic of a few-cycle Ti:sapphire oscillator. Ultrashort light pulses efficiently deposit their energy at the center of the disks where the electric field is strongly amplified by the anapole states. This leads to a progressive material modification in an extreme multishot (>1010 pulses) and a rather low fluence (<10-3 J/cm2) regime, drastically differing from other known mechanisms, such as nonthermal plasma annealing or thermal melting-induced recrystallization. We suggest that the material modification is due to femtosecond laser-induced excitation of dangling bonds, which leads to a gradual boosting of the third harmonic conversion efficiency and broadening of its spectral bandwidth.
AB - Nanoantennas made of high-index semiconductors with a strong nonlinearity and supported optical Mie-type resonances offer a promising alternative platform for nonlinear nanophotonics. In this Letter, we employ an array of amorphous silicon nanodisks with varying diameters to produce a broadband deep-ultraviolet third harmonic of a few-cycle Ti:sapphire oscillator. Ultrashort light pulses efficiently deposit their energy at the center of the disks where the electric field is strongly amplified by the anapole states. This leads to a progressive material modification in an extreme multishot (>1010 pulses) and a rather low fluence (<10-3 J/cm2) regime, drastically differing from other known mechanisms, such as nonthermal plasma annealing or thermal melting-induced recrystallization. We suggest that the material modification is due to femtosecond laser-induced excitation of dangling bonds, which leads to a gradual boosting of the third harmonic conversion efficiency and broadening of its spectral bandwidth.
KW - all-dielectric nanoantennas
KW - anapole mode
KW - deep-ultraviolet
KW - few-cycle laser
KW - silicon photonics
KW - third harmonic generation
KW - ultrafast nonlinear optics
UR - http://www.scopus.com/inward/record.url?scp=85089094758&partnerID=8YFLogxK
U2 - 10.1021/acsphotonics.0c00753
DO - 10.1021/acsphotonics.0c00753
M3 - Article
AN - SCOPUS:85089094758
VL - 7
SP - 1655
EP - 1661
JO - ACS PHOTONICS
JF - ACS PHOTONICS
SN - 2330-4022
IS - 7
ER -