The combination of photonic integrated circuits and free-space metaoptics has the ability to untie technological knots that require advanced light manipulation due to their conjoined ability to achieve strong light–matter interaction via wave-guiding light over a long distance and shape them via large space-bandwidth product. Rapid prototyping of such a compound system requires component interchangeability. This represents a functional challenge in terms of fabrication and alignment of high-performance optical systems. Here, we report a flexible and interchangeable interface between a photonic integrated circuit and the free space using an array of low-loss metaoptics and demonstrate multifunctional beam shaping at a wavelength of 780 nm. We show that robust and high-fidelity operation of the designed optical functions can be achieved without prior precise characterization of the free-space input nor stringent alignment between the photonic integrated chip and the metaoptics chip. A diffraction limited spot of ∼3 μm for a hyperboloid metalens of numerical aperture 0.15 is achieved despite an input Gaussian elliptical deformation of up to 35% and misalignments of the components of up to 20 μm. A holographic image with a peak signal-to-noise ratio of >10 dB is also reported.
Incoherent self-interference digital holography can be used for several applications, among which are high resolution fluorescence microscopy and imaging through a scattering medium. Systems in which both interfering beams originate from the same observed objects are considered as self-interference hologram recorders. Furthermore, the hologram recorders reviewed in this presentation are configured in a setup of a single channel optical system. In this presentation we describe the evolution of a well-known method of incoherent digital holography, the Fresnel incoherent correlation holography (FINCH). Following the review of FINCH, other recently developed self-reference single-channel incoherent hologram recorders, branched out from FINCH, are discussed and several biomedical-related applications are described.
KEYWORDS: Holograms, Digital holography, 3D image reconstruction, Cameras, Holography, 3D image processing, Signal to noise ratio, Image sensors, Phase only filters
Incoherent digital holography can be used for several applications, among which are high resolution fluorescence microscopy and imaging through a scattering medium. Historically, an incoherent digital hologram has been usually recorded by self-interference systems in which both interfering beams are originated from the same observed object. The self-interference system enables to read the phase distribution of the wavefronts propagating from an object and consequently to decode the 3D location of the object points. In this presentation, we survey several cases in which 3D holographic imaging can be done without the phase information and without two-wave interference.
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