研究目的
Investigating the factors affecting spatial resolution in ghost imaging using entangled signal-idler photons generated in spontaneous parametric down conversion (SPDC).
研究成果
The spatial and temporal resolution achievable in entangled ghost imaging depend on a combination of experimental parameters, phase matching properties of the SPDC crystals and the relative value of the time response of the single photon detectors and the coherence time of the biphoton. High-resolution image is obtained only if the spatial frequencies of different components can be combined coherently, which requires a detector that is faster than the biphoton coherence time.
研究不足
The spatial resolution is much poorer in the e-direction than in the o-direction due to the angular dependence of the extraordinary refractive index in the SPDC crystal. The use of single photon detectors that do not resolve the temporal coherence time of the biphoton limits the spatial resolution.
