Achieving higher resolution scales in optical microscopy allow a more rigorous investigation into the detailed components of cell systems. This higher resolution is typically achieved through super-resolution techniques utilizing methods inside the wave-like nature of light such as point spread function shaping and fluorophore switching. We wish to leverage both particle-like and wave-like natures of light to make a diffraction unlimited protocol. Our protocol uses the well known Hanbury Brown and Twiss (HBT) apparatus in combination with a customized second-order cross-correlation protocol. By performing least squares fitting of the HBT and intensity measurements we obtain diffraction unlimited localization for two particles of unknown relative brightness from few measurement locations. Our results show super-resolution enhancement by an order of magnitude after 5000 detection lifetimes.
Techniques of optical superresolution imaging are vital for uncovering the complex dynamics of biochemistry in cellular environments. However the practical resolution for superresolution imaging is limited by the increased photon budget for superresolution, compared with conventional microscopy. For this reason it is important to determine the optimal methods for analysing all of the incoming information. Most approaches to microscopy use only the wave-like properties of light, but the particle-like nature of light provides extra information that is normally inaccessible and can be used to increase imaging resolution. Here we theoretically study the localisation of quantum emitters using higher-order quantum correlation functions to understand the resolution that is practically achievable for bio-imaging tasks. We show explicit imaging results for varying number of emitters as a function of correlation order to illustrate the necessary tradeoffs between imaging resolution and acquisition time.
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