Broad Frequency Shift of Parametric Processes in Epsilon-Near-Zero Time-Varying Media
- Univ. of Glasgow, Scotland (United Kingdom). School of Physics and Astronomy; OSTI
- Imperial College, London (United Kingdom). The Blackett Laboratory, Dept. of Physics
- Purdue Univ., West Lafayette, IN (United States). Purdue Quantum Science and Engineering Inst. and School of Electrical and Computer Engineering and Birck Nanotechnology Center
- Heriot-Watt Univ., Edinburgh (United Kingdom). Inst. of Photonics and Quantum Sciences
- Heriot-Watt Univ., Edinburgh (United Kingdom). Inst. of Photonics and Quantum Sciences
- Univ. of Glasgow, Scotland (United Kingdom). School of Physics and Astronomy
- Univ. of Glasgow, Scotland (United Kingdom). School of Engineering
The ultrafast changes of material properties induced by short laser pulses can lead to a frequency shift of reflected and transmitted radiation. Recent reports highlight how such a frequency shift is enhanced in spectral regions where the material features a near-zero real part of the permittivity. Here, we investigate the frequency shift for fields generated by four-wave mixing. In our experiment, we observed a frequency shift of more than 60 nm (compared to the pulse width of ~40 nm) in the phase conjugated radiation generated by a 500 nm aluminium-doped zinc oxide (AZO) film pumped close to the epsilon-near-zero wavelength. Our results indicate applications of time-varying media for nonlinear optics and frequency conversion.
- Research Organization:
- Purdue Univ., West Lafayette, IN (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division
- Grant/Contract Number:
- SC0017717
- OSTI ID:
- 1803151
- Journal Information:
- Applied Sciences, Journal Name: Applied Sciences Journal Issue: 4 Vol. 10; ISSN ASPCC7; ISSN 2076-3417
- Publisher:
- MDPICopyright Statement
- Country of Publication:
- United States
- Language:
- English
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journal | January 2022 |
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