Published in Applied Physics Reviews, 2024
An invited reivew article on THz nanoscopy — challenges, progress, and the road ahead. (Based on part of my PhD thesis chapter 2)
Recommended citation: Guo X, Bertling K, Donose BC, Brünig M, Cernescu A, Govyadinov AA, Rakić AD. Terahertz nanoscopy: Advances, challenges, and the road ahead. Applied Physics Reviews. 2024 Jun 1;11(2) 021306.
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Published in The Journal of Physical Chemistry Letters, 2023
Observe unreported THz spectral anomaly —boson peaks— across two rare-earth metallic oxide phases on tantalum surface (beyond silicon-based), correlating to amorphous oxides at the nanoscale, which is contributing as loss channels or two-level systems in cryogenic temperature measurements.
Recommended citation: Guo X, Degnan Z, Steele JA, Solano E, Donose BC, Bertling K, Fedorov A, Rakić AD, Jacobson P. Near-field localization of the boson peak on tantalum films for superconducting quantum devices. The Journal of Physical Chemistry Letters. 2023 May 18;14(20):4892-900.
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Published in Nanophotonics, 2023
Observe surface plasmon polaritonic features in nominally high-resistiviy silicon-based quantum devices and reconstruct the multilayer nanostructure complex permittivity and the supported polariton dispersion curve
Recommended citation: Guo X, He X, Degnan Z, Chiu CC, Donose BC, Bertling K, Fedorov A, Rakić AD, Jacobson P. Terahertz nanospectroscopy of plasmon polaritons for the evaluation of doping in quantum devices. Nanophotonics. 2023 May 8;12(10):1865-75.
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Published in Applied Physics Letters, 2021
Reveal unconsidered fabrication-induced doping on nominally high-resistivity silicon transmission line in coplanar waveguide structure for superconducting quantum computing by extracting both real and imaginary part of complex permittivity and fitted by Drude model.
Recommended citation: Guo X, He X, Degnan Z, Donose BC, Bertling K, Fedorov A, Rakić AD, Jacobson P. Near-field terahertz nanoscopy of coplanar microwave resonators. Applied Physics Letters. 2021 Aug 30;119(9).
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Published in Applied Physics Letters, 2021
Extract Complex Optical Constants from s-SNOM integrated with a THz time-domain spectroscopy
Recommended citation: Guo X, Bertling K, Rakić AD. Optical constants from scattering-type scanning near-field optical microscope. Applied Physics Letters. 2021 Jan 25;118(4).
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Published in Nanotechnology, 2016
Undergraduate Research Project Outcome: Demonstrated the enhancement of organic dye degradation for wastewater treatment using ZnO-based nanoarrays, driven by the piezoelectric effect in conjunction with external ultrasonic and solar stimuli.
Recommended citation: Guo X, Fu Y, Hong D, Yu B, He H, Wang Q, Xing L, Xue X. High-efficiency sono-solar-induced degradation of organic dye by the piezophototronic/photocatalytic coupling effect of FeS/ZnO nanoarrays. Nanotechnology. 2016 Aug 8;27(37):375704.
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Published in 2024 49th International Conference on Infrared, Millimeter, and Terahertz Waves, 2024
IRMMW-THz 2024, 20-min oral presentation + a 50-min student workshop session.
Recommended citation: Guo, X., He, X., Degnan, Z., Chiu, C.C., Bertling, K., Donose, B.C., Fedorov, A., Jacobson, P. and Rakić, A.D., 2024, September. Near-field nanoscopy of terahertz collective excitations for silicon-based quantum technologies. In 2024 49th International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz) (pp. 1-2). IEEE. doi: 10.1109/IRMMW-THz60956.2024.10697801.