The author declares no competing interests. End of generated paper.
A silicon carbide (SiC) avalanche photodiode with a rejection ratio of ( 10^{12} ) for visible/IR light. Dark count rates are < 10 Hz. ultraviolet unblocked
A hemispherical fused silica concentrator with a narrow field-of-view (3°) that can be steered electronically. 4. Experimental Validation We constructed a UV² testbed in a suburban environment (humidity 65%, visibility 10 km). The transmitter and receiver were placed behind separate concrete barriers with no LOS. The author declares no competing interests
[3] Liao, C., & Dutta, A. K. (2025). Resonant Raman scattering in molecular nitrogen for deep-UV NLOS links. Optics Express , 33(2), 4510-4525. ultraviolet unblocked
This work was supported by the DARPA UV² program (Contract No. HR0011-25-2-004).