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9 November 2016 Frequency conversion in optically-excited active metadevices (Conference Presentation)
Bumki Min
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Proceedings Volume 9918, Metamaterials, Metadevices, and Metasystems 2016; 99181P (2016) https://doi.org/10.1117/12.2239401
Event: SPIE Nanoscience + Engineering, 2016, San Diego, California, United States
Abstract
The plethora of nonlinear optical phenomena can provide an innovative route for developing subwavelength-scale functional optical devices. One of the examples may be the nonlinear mixing of low energy photons (of which the wavelength is a few hundred micrometers) in atomically-thin materials. Here,the experimental proof on the optically-induced nonlinear mixing of terahertz resonances in graphene-integrated metadevices will be presented. Upon ultrafast optical excitation, the conductivity of graphene is reduced for a few picoseconds due to the increase in the Dirac-fermion scattering rate. This fast temporal change of graphene conductivity provides time-varying perturbation to the graphene-integrated metadevices and generates a difference frequency component by the mixing of meta-atoms’ two electric dipole resonances. Ultrafast terahertz spectroscopy corroborates that the characteristic difference-frequency resonance indeed originates from the coupled interaction between graphene and meta-atoms. Further elaborating this concept, it will be shown that the sudden merging of distinct meta-atoms’ resonances by ultrafast optical excitation can also result in frequency conversion.
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Bumki Min "Frequency conversion in optically-excited active metadevices (Conference Presentation)", Proc. SPIE 9918, Metamaterials, Metadevices, and Metasystems 2016, 99181P (9 November 2016); https://doi.org/10.1117/12.2239401
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KEYWORDS
Frequency conversion
Graphene
Active optics
Nonlinear optics
Ultrafast phenomena
Optical components
Photons
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