Person: Rubin, Noah
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Rubin, Noah
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Publication Metasurface Optics for On-Demand Polarization Transformations Along the Optical Path(Springer Science and Business Media LLC, 2021-01-28) Dorrah, Ahmed H.; Rubin, Noah; Zaidi, Muhammad; Tamagnone, Michele; Capasso, FedericoPolarization plays a key role in science; hence its versatile manipulation is crucial. Existing polarization optics, however, can only manipulate polarization in a single transverse plane. Here, we demonstrate a new class of polarizers and waveplates, based on metasurfaces, that can impart an arbitrarily chosen polarization response along the propagation direction, regardless of the incident polarization. The underlying mechanism relies on transforming an incident waveform into an ensemble of pencil-like beams with different polarization states that beat along the optical axis thereby changing the resulting polarization at-will, locally, as light propagates. Remarkably, using form birefringent metasurfaces combined with matrix-based holography enable the desired propagation-dependent polarization response to be enacted without a priori knowledge of the incident polarization—a behavior that would require three polarization sensitive holograms if implemented otherwise. Our work expands the use of polarization in the design of multi-functional metasurfaces and may find application in tunable structured light, optically switchable devices, and versatile light-matter interactions.Publication Metasurface-enabled single-shot and complete Mueller matrix imaging(Springer Science and Business Media LLC, 2024-05-02) Zaidi, Muhammad; Rubin, Noah; Meretska, Maryna L.; Li, Lisa; Dorrah, Ahmed; Park, Joon-Suh; Capasso, FedericoWhen light scatters off an object, its polarization, in general, changes - a transformation described by the object's Mueller matrix. Mueller matrix imaging is an important technique in science and technology to image the spatially varying polarization response of an object of interest, to reveal rich information otherwise invisible to traditional imaging. In this work, we conceptualize, implement and demonstrate a compact Mueller matrix imaging system - composed of a metasurface to produce structured polarization illumination and a metasurface for polarization analysis - that can, in a single shot, acquire all sixteen components of an object’s spatially-varying Mueller matrix over an image. Our implementation, which is free of any moving parts or bulk polarization optics, should enable and empower applications in real-time medical imaging, material characterization, machine vision, target detection, and other important areas.Publication High-efficiency chiral meta-lens(Nature Publishing Group UK, 2018) Groever, Benedikt; Rubin, Noah; Mueller, J. P. Balthasar; Devlin, Robert C.; Capasso, FedericoWe present here a compact metasurface lens element that enables simultaneous and spatially separated imaging of light of opposite circular polarization states. The design overcomes a limitation of previous chiral lenses reliant on the traditional geometric phase approach by allowing for independent focusing of both circular polarizations without a 50% efficiency trade-off. We demonstrate circular polarization-dependent imaging at visible wavelengths with polarization contrast greater than 20dB and efficiencies as high as 70%.