Plasmon Coupling—The Root Cause of Raman Anomaly and Laser Cooling in Nanocrystal Ge
نویسندگان
چکیده
Laser cooling of matter through anti-Stokes photoluminescence, where the emitted frequency light exceeds that impinging laser by virtue absorption thermal vibrational energy, has been successfully realized in condensed media, and particular with rare-earth-doped systems achieving sub-100 K solid-state optical refrigeration. Studies suggest semiconductors potential temperatures down to ≈10 its direct integration can usher unique high-performance nanostructured semiconductor devices. While II–VI reported recently, indirect bandgap such as group IV silicon germanium remains a major challenge. Herein, anomalous observation dominant photoluminescence nanocrystals principally associated plasmon coupling is reported. Specifically, this Raman anomaly confluence ultrahigh-purity nanocrystal germanium, generation high density electron–hole plasma, inherent degeneracy longitudinal transverse phonons nonpolar semiconductors, simultaneous spatial confinement effects are attributed. At intensities, plasmon-assisted lattice temperature low ≈50 inferred.
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ژورنال
عنوان ژورنال: Advanced photonics research
سال: 2022
ISSN: ['2699-9293']
DOI: https://doi.org/10.1002/adpr.202200251