In this paper we show how a tightly focused pump beam can be used to alter the local refractive index of the sample. This local variation acts as a scattering site, which enables resolution exceeding that of a conventional scanning microscope to be obtained in the far field. The improvement in resolution depends on a number of factors which are discussed in the paper, including the optical configuration (confocal or non-confocal), the thermal properties of the sample, the 'strength' of the object and the duration of the heating pulse. Experimental results confirming the theoretical predictions are presented; these demonstrate more than 25% improvement in edge response compared with a conventional scanning system.
|Number of pages||8|
|Journal||Journal of Microscopy|
|Publication status||Published - 1 Jan 1999|
- Abbe criterion
- Confocal microscopy
- Scanning optical microscopy
ASJC Scopus subject areas