Abstract
This paper provides the state-of-art review to the research works in diffraction-limit breaking focusing and imaging. Firstly,the research background and significance of the research in this field are given,and the well-developed super-resolution methods and the definition of scattering media towards diffraction-limit breaking imaging are also introduced. Secondly,the time reversal technique utilizing the scattering property in acoustics and electromagnetics for signal compressing and focusing are specified. The realization method of time reversal in domain of optics is presented. As a foundation for better understanding,the advantages brought about by inserting a plate of scattering media into certain optical imaging system are further elaborated. Thirdly,this review analyzes the serial feedback controlling method,optical phase conjugation and the transmission measurement based on phase conjugation for finest focusing. The groundbreaking transmission matrix measurement in both spatial and spatial frequent domain is introduced,which is followed by the preparation of scattering media aiming at the far-field and wide-field diffraction-limit breaking imaging using transmission matrix method. Finally,the advances and prospect on techniques of breaking diffraction limication using scattering medium are preposed.
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