Journal
PHYSICAL REVIEW B
Volume 84, Issue 15, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.84.153413
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Funding
- Volkswagenstiftung and Baden-Wurttemberg Stiftung
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We demonstrate background-free subdiffraction optical microscopy with upconverting YAG nanoparticles doped with trivalent praseodymium ions (Pr : YAG). The presented microscopy with Pr : YAG nanoparticles takes advantage of three facts. First, while excited with visible laser light, Pr : YAG nanoparticles can emit upconverted ultraviolet (UV) radiation, thus allowing for background-free microscopy. Second, the technique based on exploiting donut-shaped laser beam was introduced to obtain subdiffraction-limited optical resolution. All optical resolution of 50 nm limited by the size of the particles was achieved. Third, Pr : YAG nanoparticles are absolutely photostable. This technique resembles stimulated emission depletion microscopy (STED) though it is significantly different from STED since it involves stimulated absorption rather than stimulated emission.
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