Columbia University

Harvard College

Università Degli Studi Di Trento

Nanfang Yu

Meng Tian

Adam Overvig

Norman Nan Shi

Federico Capasso

Jyotirmoy Mandal

Yuan Yang

Michal Lipson

Romain Blanchard

James Hone

Francesco Aieta

Mikhail A Kats

Patrice Genevet

Guozhen Liang

Sajan Shrestha

Gaurang R Bhatt

Zhaoyi Li

Ipshita Datta

Myoung-Hwan Kim

Zeno Gaburro

Sanghoon Chae

Jonathan Fan

Stephanie Malek

Heqing Huang

Dmitri N Basov

Devices for radiative cooling and optical waveguiding are provided, wherein the devices comprise a fabric including one or more fibers extending for a length in a longitudinal direction and a plurality of void structures positioned within each of the one or more fibers and extended over the length of each of the one or more fibers. Each of the plurality of void structures is configured to scatter at least a portion of an electromagnetic radiation received thereon to thereby radiatively cool the object.

Devices and methods for radiative cooling

A structured material is provided that includes a substrate and a porous structured polymer layer disposed thereon. The porous structured polymer layer includes a plurality of voids, and has a high hemispherical reflectance a high a hemispherical thermal emittance. The structured material is thus particularly advantageous for cool-roof coatings, enabling surfaces coated by the material to stay cool, even under strong sunlight. The material can be produced via structuring of polymers in a mixture including a solvent and a non-solvent. Sequential evaporation of the solvent and the non-solvent provide a polymer layer with the plurality of voids.

Scalable method of fabricating structured polymers for passive daytime radiative cooling and other applications

A switchable light transmission module is disclosed that includes a substrate having a first surface defining at least part of an enclosed volume, a porous layer disposed on the first surface and in fluid communication with the enclosed volume, and a reservoir in fluid communication with the enclosed volume. The reservoir is configured to supply a fluid to the sealed volume such that the fluid contacts the porous layer. The fluid has a refractive index that is close to the refractive index of the porous layer, has a high wettability for the porous layer, and does not dissolve the porous layer. When in a dry state, voids in the porous layer are filled with air which has a much different refractive index than the porous layer itself, resulting in a surface that is reflective and not very transmissive. During wetting of the porous layer by the fluid, however, those voids are filled with the fluid, reducing the difference in refractive index across the polymer-fluid interfaces such that light scattering is negligible and the surface becomes light permeable.

Techniques for creating a replacement for optical elements with diffractive planar components based on metasurfaces are provided. In one example, a substantially flat optical component for lensing incoming electromagnetic radiation having at least one wavelength and a first phase into outgoing electromagnetic radiation having a second phase is provided.

Broadband achromatic flat optical components by dispersion-engineered dielectric metasurfaces

The systems described herein can be used to modulate either the phase, the amplitude, or both of an input light wave using micro-resonators to achieve desired degrees and/or types of modulation.

Amplitude and phase light modulator based on miniature optical resonators

The disclosed subject matter provides systems and methods for spatial and spectral modulation of light. An example system for modulating light can include a substrate and a plurality of meta units, coupled to the substrate and configured to spatially and spectrally modulate the light, wherein the plurality of meta units includes a perturbation and forms a perturbed lattice supporting a quasi-bound state in the continuum.

Multifunctional resonant and leaky-wave metasurfaces based on symmetry-breaking perturbations

Systems and methods for radiative cooling and heating are provided. For example, systems for radiative cooling can include a top layer including one or more polymers, where the top layer has high emissivity in at least a portion of the thermal spectrum and an electromagnetic extinction coefficient of approximately zero, absorptivity of approximately zero, and high transmittance in at least a portion of the solar spectrum, and further include a reflective layer including one or more metals, where the reflective layer has high reflectivity in at least a portion of the solar spectrum.

Systems and methods for radiative cooling and heating

Methods, systems, and devices are described for electro-optic tuning. An example device may comprise a first layer comprising a transition metal di-chalcogenide material, a second layer comprising a conductive material, and a third layer comprising a dielectric material. The third layer may be disposed at least partially between the first layer and the second layer. An electrical potential difference applied between the first layer and the second layer may cause a tunable refractive index change in the first layer.

Electro-refractive modulation in photonic structures

Systems and methods for detecting a change in at least one physical parameter of a target illuminated by electromagnetic radiation are disclosed herein. The system includes one or more optical fibers, an optical switch, and a photo detector. The optical fiber switch can transmit at least a portion of the electromagnetic radiation into the one or more optical fibers. The optical fibers can have a plurality of sensor nodes. The sensor nodes can induce an interaction between the change in the at least one physical parameter and the transmitted electromagnetic radiation to generate an optical signal. The photo detector can be connected to the one or more optical fibers and measure the optical signal.

Integrated optical surveillance systems for changes in physical parameters

Exemplary embodiment can utilize the properties of tunable thin-film, material (e.g., graphene) to efficiently modulate the intensity, phase, and/or polarization of transmitted and/or reflected radiation, including mid-infrared ('mid-IR') radiation. Exemplary embodiments include planar antennas comprising tunable thin-film material sections and metallic sections disposed in contact with the tunable thin-film material sections, each metallic section having a gap with at least one dimension related to a wavelength of the radiation, which in some embodiments may be less than the wavelength. The metallic layer may comprise rods arrange in one or more shapes, or one or more apertures of one or more shapes. Embodiments of the antenna may also comprise a substrate, which may be a semiconductor or conductor in various embodiments. Embodiments also include systems, computer-implemented methods, devices, and computer-readable media for effectuating desired modulation of incident radiation by, e.g., varying the doping level of the tunable thin-film material.

System, method and computer-accessible medium for depth of field imaging for three-dimensional sensing utilizing a spatial light modulator microscope arrangement

Integrated photonic devices including an optical waveguide patterned with an array of antennas are provided. The small footprint, lightweight, and broadband integrated photonic devices provided can be configured into waveguide mode converters, polarization rotators, perfect absorbers, photodetectors, optical power diodes, nonlinear optical elements, heat-assisted magnetic recorders, optical isolators, and optical circulators.

Growing community of inventors

New York, NY, United States of America

Nanfang Yu