Metallic-like photoluminescence and absorption in fused silica surface flaws

Laurence, Ted A.; Bude, Jeff D.; Shen, Nan; Feldman, Theodore; Miller, Philip E.; Steele, William A.; Suratwala, Tayyab
April 2009
Applied Physics Letters;4/13/2009, Vol. 94 Issue 15, p151114
Academic Journal
Using high-sensitivity confocal time-resolved photoluminescence (PL) techniques, we report an ultrafast PL (40 ps–5 ns) from impurity-free surface flaws on fused silica, including polished, indented, or fractured surfaces of fused silica, and from laser-heated evaporation pits. This PL is excited by the single-photon absorption of sub-band gap light, and is especially bright in fractures. Regions which exhibit this PL are strongly absorptive well below the band gap, as evidenced by a propensity to damage with 3.5 eV nanosecond-scale laser pulses.


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