Two-dimensional weak-object transfer functions in the scanning harmonic microscope

The two-dimensional imaging properties of scanning harmonic microscopes are considered. The two-dimensional weak-object transfer functions for non-con focal (point source and large-area incoherent detector) and confocal (point source and point detector) scanning harmonic microscopes are calculated. R esults show that the harmonic microscopes are capable of super-resolution i n that the spatial frequency cut-off is twice that for a microscope working at the fundamental wavelength. Confocal scanning harmonic microscopes exhi bit better resolution than the conventional type.