Spintronic photonic crystal THz source on ultrawide bandgap semiconductors

Qing Gu

doi:10.1117/12.3027468

4 October 2024 Spintronic photonic crystal THz source on ultrawide bandgap semiconductors

Qing Gu

Author Affiliations +

Proceedings Volume PC13119, Spintronics XVII; PC1311912 (2024) https://doi.org/10.1117/12.3027468
Event: Nanoscience + Engineering, 2024, San Diego, California, United States

Abstract

THz signals can be generated from photoconductive antennas, nonlinear crystals, air plasma, and spintronic devices. Among these various THz sources, only the spintronic emitter, typically constructed with ferromagnet and heavy metal heterostructures offers a way to generate a gapless broadband emission spectrum from 0.3 THz to 20 THz with low joule heating. We show that ferromagnet/ultrawide bandgap (UWBG) semiconductor heterostructures are superior to traditional ferromagnet/heavy metal heterostructures as the platform for spintronic THz sources, as they simultaneously allow broadband THz emission, tunability, and compatibility with existing integrated circuit (IC) platforms. Furthermore, by patterning the heterostructure into a photonic crystal with arrays of subwavelength pillars, transmission enhancement, wavelength selectivity, and radiation pattern engineering of emitted THz signal can be achieved. We believe this work offers an IC-compatible solution for broadband and tailorable THz generation.

Conference Presentation

Citation Download Citation

Qing Gu "Spintronic photonic crystal THz source on ultrawide bandgap semiconductors", Proc. SPIE PC13119, Spintronics XVII, PC1311912 (4 October 2024); https://doi.org/10.1117/12.3027468

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