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Label‐free super‐resolution (LFSR) imaging relies on light‐scattering processes in nanoscale objects without a need for fluorescent (FL) staining required in super‐resolved FL microscopy. The objectives of this Roadmap are to present a comprehensive vision of the developments, the state‐of‐the‐art in this field, and to discuss the resolution boundaries and hurdles that need to be overcome to break...
Roadmap on Label‐Free Super‐Resolution Imaging
In article number 2200029, Vasily Astratov and colleagues representing 27 research teams worldwide created a roadmap on label‐free super‐resolution imaging. Its scope spans from diffraction‐limited interference detection techniques to methods allowing to overcome classical diffraction limit without using fluorescent markers, which are based on information...
In this paper, we present a new approach to super-resolution optical imaging, based on structured illumination in hyperbolic media. Hyperbolic materials, either natural crystals or artificial composites with the opposite signs of the dielectric permittivity components in two orthogonal direction, support propagating waves with the wavenumbers unlimited by the frequency, and therefore allow the generation...
Hyperbolic metamaterials possess unique optical properties owing to their hyperbolic dispersion. As hyperbolic metamaterials can be constructed just from periodic multilayers of metals and dielectrics, they have attracted considerable attention in the nanophotonics community. Here, we review some of our recent works and demonstrate the benefits of using hyperbolic metamaterials in plasmonic waveguides...
We demonstrate simultaneous enhancement in spontaneous emission rate and light extraction from hyperbolic metamaterials embedded with quantum dots using a high contrast grating. Enhancements of twenty-fold in extraction and thirteen-fold in emission rate are observed.
Photonic hyper-crystals represent a new class of artificial optical media. These composites, which are hyperbolic metamaterials with periodic spatial variation of dielectric permittivity on a subwavelength scale, combine the features of optical metamaterials and photonic crystals.
We present a tunable hyperbolic metamaterial by exploiting the metal-insulator phase transition in vanadium oxide and demonstrate the transition of its in-plane dielectric constant from positive to negative value by temperature control.
Directional light extraction from high-k modes in a hyperbolic metamaterial (HMM) is demonstrated by direct coupling of resonance cones from quantum dots (QDs) underneath a metal-dielectric composite to a high index bulls-eye grating structure.
We demonstrate that non-locality can induce a new type of optical topological transition in photonic metamaterials. We describe the corresponding critical state and analyze the optical properties of such media.
Experiments demonstrate that inside strongly anisotropic materials with hyperbolic dispersion, light diffracted from double slits propagates as volume plasmon polaritons and form subwavelength interference peaks that can be used in subwavelength photolithography and probes.
We present new types of focusing devices consisting of metallic nanoslits with proof-of-concept experiments. Polarization-selective nanoslit lenses can focus or defocus linearly polarized light depending on the incident polarization. The interference peak from double slits inside a strongly anisotropic medium becomes sub-wavelength. We also present our work on scattering from a strongly anisotropic...
Our experiment demonstrates a subwavelength-wide peak from double-slit diffraction inside a slab with hyperbolic dispersion; this highly localized field can be used for subwavelength probes.
We deomonstrate the existence of optical topological transition, the optical equivalent of Lifshitz transition in electronic systems, by controlling the topology of the optical isofrequency curve using metamaterials.
We report the broadband (∼ 25 nm) control of radiative decay rate of colloidal quantum dots by exploiting the flat dispersion of a one-dimensional nonmagnetic metamaterial structure.
We propose a metamaterial device that exhibits a broadband singularity in the photonic density of states and negative refraction. These resonant and non-resonant effects allow control over decay rates using a planar nanoscale structure.
We describe a scheme for far-field subwavelength fingerprinting in the mid-IR and THz bands. The approach relies on evanescent wave retrieval, mediated by scattering on a subwavelength nanostructure.
We report the broadband (~ 25 nm) enhancement of radiative decay rate of colloidal quantum dots by exploiting the hyperbolic dispersion of a one-dimensional nonmagnetic metamaterial structure.
We propose a novel scheme for subwavelength-resolved spatial spectroscopy in the mid-IR and THz bands. Our approach relies on scattering from an acoustic grating and allows far-field detection of high spatial frequency Fourier components.
Stealth communication using coherent SPE-OCDMA is demonstrated. The coherent approach can provide higher spectral efficiency than incoherent optical CDMA.
We study ray dynamics inside the Hyperlens, a device recently demonstrated as capable of sub-diffraction-limited far-field imaging. The obtained semiclassical result of spiraling rays is confirmed by numerical simulations of gaussian beam scattering from the hyperlens.
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