Abstract
We report an experimental demonstration of a nonclassical imaging mechanism with super-resolving power beyond the Rayleigh limit. When the classical image is completely blurred out due to the use of a small imaging lens, by taking advantage of the intensity fluctuation correlation of thermal light, the demonstrated camera recovered the image of the resolution testing gauge. This method could be adapted to long distance imaging, such as satellite imaging, which requires large diameter camera lenses to achieve high image resolution.
Highlights
We report an experimental demonstration of a nonclassical imaging mechanism with super-resolving power beyond the Rayleigh limit
A commonly used simple approach is to measure the autocorrelation of two identical classical images, effectively squaring the classical image, 〈I1(ρ1)〉〈I1(ρ1)〉, where ρ1 is the transverse coordinate of the detector
The physics behind this super-resolution is similar to the original thermal light ghost imaging[7,8], and is quite different from an autocorrelation measurement
Summary
We report an experimental demonstration of a nonclassical imaging mechanism with super-resolving power beyond the Rayleigh limit. The imaging resolution of such a setup can be further improved by changing the measurement from 〈I1(ρ1)〉〈I 1(ρ1)〉, in terms of intensity, or 〈n1(ρ1)〉〈n1(ρ1)〉, in terms of photon number counting, to the intensity fluctuation correlation 〈ΔI1(ρ1)ΔI2(ρ2)〉, or 〈Δn1(ρ1)Δn2(ρ2)〉, where ρ1 and ρ2 are the transverse coordinates of two spatially separated detectors. If only those fluctuation correlations due to the higher spatial frequencies from ΔI2(ρ2) are selected, a super-resolving image can be observed from the joint detection of the intensity fluctuations at the two detectors. The measurement can be formulated as ΔRc(ρ1) =〈ΔI1(ρ1) ∫dκ2F(κ2)ΔI2(κ2)〉, where F(κ2) is a filter function which selects the higher spatial frequencies
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