Ultra high resolution point spread function based on photonic crystal lens for 3D biomedical applications

Author's Department

Physics Department

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Norhan A. Salama, Mohamed A. Swillam, Mohamed Farhat O. Hameed, Y. Badr, Shaimaa M. Alexeree, Salah S. A. Obayya

Document Type

Research Article

Publication Title

Optical and Quantum Electronics

Publication Date

Spring 2-4-2023




In this paper, a novel design of superlens based on photonic bandgap structure for high resolution point spread function (PSF) is reported at a wavelength of 3 μm. The lens is able to generate a non-difraction Bessel beam with a number of focusing points with variant resolution limits. The optimized structure provides high resolution in both lateral and axial directions. The maximum achieved lateral resolution of PSF is down to~0.27λ with corresponding axial resolution down to~0.57λ attaining a FOM, the inverse of the product of both resolution limits, of~6.49. Meanwhile, the maximum axial resolution is down to~0.4λ with corresponding lateral resolution down to~0.33λ with a FOM of~7.34. In addition, the proposed design is able to generate a focusing point extended in space up to~0.98 µm with a sub-difraction lateral resolution down to~0.47λ. Furthermore, the reported superlens demonstrates a sub-difraction focusing in lateral direction along the range the bandgap wavelengths (from 2.4 to 3.6 µm) showing a signifcant increase of focal depth when decreasing the operating wavelength. Remarkably, a high focal depth up to~1.77 µm is achieved at the operating wavelength of 2.6 µm. The suggested design has a tremendous potential in 3D biological imaging and biosensing applications

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