Journal
PHYSICAL REVIEW LETTERS
Volume 113, Issue 26, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.113.263901
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Funding
- State Key Program for Basic Research of China [2012CB 921904]
- National Natural Science Foundation of China [61205018, 61475038]
- Fundamental Research Funds for the Central Universities
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The resolution limit of far-field optical microscopy is reexamined with a full vectorial theoretical analysis. A highly symmetric excitation optical field and optimized detection scheme are proposed to harness the total point-spread function for a microscopic system. Spatial resolution of better than 1/6 lambda is shown to be obtainable, giving rise to a resolution better than 100 nm with visible light excitation. The experimental measurement is applied to examine nonfluorescent samples. A lateral resolution of 1/5 lambda is obtained in truly far-field optical microscopy with a working distance greater than similar to 500 lambda. Comparison is made for the far-field microscopic measurement with that of a nearfield scanning optical microscopy, showing that the proposed scheme provides a better image quality.
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