Meta‐Imaging: from Non‐Computational to Computational

Abstract

Metamaterials are artificial media composed of periodic/aperiodic subwavelength metal/dielectric structures (i.e., meta-atom). This class of media possess electromagnetic properties not present in the constituent materials and have yielded breakthrough electromagnetic phenomena. The capability of tailoring effective electric permittivity and magnetic permeability responses leads to a wide range of accomplishments, such as enhanced nonlinearity, [1] and electromagnetic cloak. [2] However, high losses, strong

Principles, Functions, and Applications of Optical Meta‐Lens

“…Recent results indicate that the unprecedented functions of the meta‐lens can be further enhanced by using computational methods. [ 182 ]…”

“…Recent results indicate that the unprecedented functions of the meta-lens can be further enhanced by using computational methods. [182] Meta-lenses with novel functions can be incorporated into many existing optical systems to achieve new features and a more compact configuration. For example, meta-lenses can be used for optical diffusion, filtering, beam shaping and/ or splitting, pattern generation, multi-dimensional light-field manipulation, etc., by the combination of specific multiple IRUs.…”

Conformally Mapped Mikaelian Lens for Broadband Achromatic High Resolution Focusing

“…On the other hand, most of metalenses based on the metasurface [ 20 ] that have yielded excellent high resolution focusing and imaging performance [ 21–27 ] are restricted by limited NA and working bandwidth. For the high‐resolution focusing metalenses, the best achievement is to yield a sharp point in the far field with near‐unity NA (NA = 0.98) and FWHM of 0.332 λ , [ 28 ] which can just work effectively at the frequency of 22.4 GHz.…”

Single‐Shot Reference‐Free Holographic Imaging using a Liquid Crystal Geometric Phase Diffuser

“…In addition, as the number of input basis vectors increases, it becomes increasingly difficult to ensure that the interferometer is stable throughout the entire calibration sequence, which practically limits the acquirable resolution or field of view (FOV). With the advent of a vigorous utilization of metamaterials as imaging components, [ 15 ] a metasurface diffuser has been suggested to circumvent the TM calibration issue in the SSM. [ 12 ] Because the TM of the designed diffuser is predefined, it can be readily used for the SSM without calibration.…”