Photonics Research, Volume. 8, Issue 3, 263(2020)
Ultrafast polarization-dependent all-optical switching of germanium-based metaphotonic devices
Fig. 1. (a) Schematic illustration of the ultrafast THz polarization-dependent metamaterial device configuration for OPTP spectral measurement. (b) Schematic of the metamaterial unit cell. The geometric parameters are listed as follows:
Fig. 2. Experimentally measured spectral dispersion of transmission spectra for the polarization-related metadevice in THz (a)
Fig. 3. Numerically calculated
Fig. 4. Experimentally measured group delay spectra of the polarization-related metadevice for THz (a)
Fig. 5. Color map showing the transient evolution of THz transmission amplitude against frequency and time delay pumped with fluence of
Fig. 6. Negative differential transmission of 125 nm thick Ge film coated on quartz substrate pumped for a series of selected powers (as labeled). The experimental measurement is fitted using a single exponential function. These plots are vertically arranged for distinct comparison.
Fig. 7. Transmission spectra of SRR resonators and CRR resonators for (a)
Fig. 9. Numerically calculated
Fig. 10. Contour map showing the transient evolution of THz group delay against frequency and time delay over an entire on-off photoswitching cycle, under a pump fluence of
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Hao Sun, Yuze Hu, Yuhua Tang, Jie You, Junhu Zhou, Hengzhu Liu, Xin Zheng. Ultrafast polarization-dependent all-optical switching of germanium-based metaphotonic devices[J]. Photonics Research, 2020, 8(3): 263
Category: Surface Optics and Plasmonics
Received: Oct. 17, 2019
Accepted: Dec. 18, 2019
Published Online: Feb. 10, 2020
The Author Email: Xin Zheng (zhengxin@nudt.edu.cn)