Abstract: An optical construction includes a reflective polarizer and an optical film. The optical film includes a matrix and a plurality of first particles dispersed in the matrix. Each of the matrix and the plurality of first particles includes a silicone polyoxamide and an acrylate polymer. For substantially normally incident light and for at least a first wavelength in a first wavelength range, the reflective polarizer reflects about 60% for a first polarization state and transmits about 40% for an orthogonal second polarization state. For at least a second wavelength in a second wavelength range, each of the reflective polarizer and the optical film transmits about 60% of an incident light for each of the first and second polarization states. For at least the first wavelength, optical film has an optical haze and a depolarization ratio. A ratio of the depolarization ratio to the optical haze is less than 0.1.

Abstract: A structured optical surface and an optical imaging system including the structured optical surface is described. The structured optical surface includes a plurality of structures formed by an intersection of at least first and second Fresnel patterns, such that when the structured optical surface is incorporated in an optical imaging system comprising a pixelated display surface with at least one pixel comprising at least two sub-pixels spaced apart by a gap, the structured optical surface images the at least two sub-pixels onto an image surface as at least two corresponding imaged sub-pixels spaced apart by a corresponding imaged gap, and the structured optical surface diffracts light so that the diffracted light at least partially fills the imaged gap without substantially overlapping any of the at least two imaged sub-pixels.

Abstract: A protected sample collection media for use in a sample collection device includes a piece of porous sample collection media having a first major side and an opposing second major side; and a protective sheath fully covering the first major side and the second major side. The protective sheath has a first portion and a second portion. The first portion is removable without removing the second portion. The second portion forms a tab constructed to be gripped by hand. The protected sample collection media may be part of a system including a sample collection device. The system may be provided as a kit including instructions for use of the kit.

Abstract: A sample collection device includes a housing including an exhalation portion and a coupling portion. The coupling portion can be coupled with/to a sample collection tube. An airflow path extends through the housing. The device further includes porous sample collection media partially disposed between within the housing and arranged to occlude the airflow path. The porous sample collection includes nonwoven material and may include polylactic acid, polypropylene, or a combination thereof. The housing can be a single piece, part, or component, or can be multiple pieces, parts, components, or portions. In an embodiment of a two-piece housing, the first part includes an exhalation piece (e.g., a mouthpiece or nosepiece) and the second part includes a coupling end constructed for coupling with a sample collection tube.

Abstract: A sample collection system includes a housing comprising a first part and a second part, the first and second parts being movable relative to one another; porous sample collection media disposed along an airflow path in the first part; and an assay disposed on the second part and constructed to receive a sample captured by the porous sample collection media. The first and second parts are rotatably movable relative to one another. Moving the first and second parts relative to one another aligns the porous sample collection media with at least a portion of the assay. The assay may be a lateral flow assay or a vertical flow assay. The media is constructed to collect a sample from exhalation airflow. A collected sample may be eluted from the media onto the assay using a liquid.

Abstract: A light control layer includes alternating transmissive and absorptive regions, along one or two dimensions. The light control layer may be substantially transparent, or have high transmission, for light incident at or near a normal angle to its surface, while absorbing light incident at angles away from normal. The height of the absorptive region, defined orthogonal to the local display surface, may be much greater than the width of the absorptive region resulting in a high aspect ratio structure. The width of the absorptive region may be relatively thin compared to the width of a pixel in a display. The light control layer may be applied to a display or incorporated into a display. The light control layer may be part of a film stack including other functional layers that cooperatively provide desirable optical properties.

Abstract: A sample collection device includes a planar sheet of material having opposing edges and a first major surface and an opposing second major surface, the planar sheet of material having at least two fold lines. A porous sample collection media has at least three edges and opposing major surfaces, at least one edge is fixed to the first major surface of the planar sheet of material. The planar sheet of material is configured to form an airflow channel by fixing the opposing edges together, the airflow channel extends from a mouthpiece end to an air outlet end. The porous sample collection media substantially occludes the airflow channel between the mouthpiece end and the air outlet end.

Abstract: A sample collection system includes a housing comprising a first part and a second part, the first and second parts being movable relative to one another; porous sample collection media disposed along an airflow path in the first part; and an assay disposed on the second part and constructed to receive a sample captured by the porous sample collection media. The first and second parts may be slidably movable relative to one another. The first and second parts may be rotatably movable relative to one another. Moving the first and second parts relative to one another aligns the porous sample collection media with at least a portion of the assay. The assay may be a lateral flow assay or a vertical flow assay. The media is constructed to collect a sample from exhalation airflow. A collected sample may be eluted from the media onto the assay using a liquid.

Abstract: A sample collection device includes a housing extending from a mouthpiece end to an air outlet end, the housing defining an airflow channel from the mouthpiece end to the air outlet end, the mouthpiece end configured to receive an exhalation airflow. A porous sample collection media is fixed within the housing and along the airflow channel. A mouthpiece end cap is replaceably coupled to the mouthpiece end and an air outlet end cap is replaceably coupled to the air outlet end.

Abstract: The present disclosure relates to sample collection devices and sample collection and testing devices. The devices described herein includes a housing defining a fluid channel from a first portion to a second portion. The devices further include a porous sample collection media disposed within the housing and in fluid communication with the fluid channel. The devices further include a fluid inlet port disposed in fluid communication with the porous sample collection media. The fluid inlet port is configured to direct a test fluid onto the porous sample collection media. The sample collection device further includes an assay configured to receive a fluid that was incident on the porous sample collection media (and eluent) and test that eluent for the presence (or absence) of a pathogen or virus.

Abstract: The present disclosure provides a sample collection device. The sample collection device includes a housing defining a fluid channel from a first portion to a second portion. The sample collection device further includes a porous sample collection media disposed within the housing and in fluid communication with the fluid channel. The sample collection device further includes a fluid inlet port disposed in fluid communication with the porous sample collection media. The fluid inlet port is configured to direct a test fluid onto the porous sample collection media. The sample collection device further includes an assay configured to receive a fluid that was incident on the porous sample collection media.

Abstract: A sample collection device including a housing extending from a mouthpiece portion to an air outlet portion. The housing defines an airflow channel from the mouthpiece portion to the air outlet portion. The mouthpiece portion is configured to receive an h exhalation airflow. A porous sample collection media is disposed within the housing and along the airflow channel. A fluid inlet port defines an aperture through the housing and is adjacent to the porous sample collection media. The fluid inlet port is configured to direct id onto the porous sample collection media. A metered fluid dose element is attached to the fluid inlet port. The metered fluid dose element is configured to dispense a metered volume of fluid into the fluid inlet port.

Abstract: A gradient permittivity film comprises (a) a first permittivity layer comprising a first continuous matrix of a first material having a first relative permittivity (?r1) and a second component having a second relative permittivity (?r2) dispersed in the first continuous matrix, the first permittivity layer having a first effective layer relative permittivity (?1) and a thickness (T1); And (b) a second permittivity layer having a second effective layer relative permittivity (?2) and a thickness (T2) disposed on the first permittivity layer. T1=0.8(t1) to 1.2(t1), where t 1 = c 4 ? f ? ? 1 ; ? T 2 = 0.8 ( t 2 ) ? to 1.2 ( t 2 ) , where ? t 2 = c 4 ? f ? ? 2 .

Abstract: A polymeric film including a major surface having a plurality of intersecting extended structures is described. For at least a majority of the structures in the plurality of extended structures: each structure extends along a length of the structure, has an average width along a direction transverse to the length and generally along the first major surface, and has an average height along a direction generally perpendicular to the first major surface; and the average width of the structure may be in a range of 1 to 200 micrometers, the average height of the structure may be in a range of 1 to 200 micrometers, and the length may be at least 3 times the average width. The extended structures may be randomly or pseudorandomly oriented and may be formed by microreplicating a surface of a paper.

Abstract: An optical construction includes a reflective polarizer and an optical film. The optical film includes a matrix and a plurality of first particles dispersed in the matrix. Each of the matrix and the plurality of first particles includes a silicone polyoxamide and an acrylate polymer. For substantially normally incident light and for at least a first wavelength in a first wavelength range, the reflective polarizer reflects about 60% for a first polarization state and transmits about 40% for an orthogonal second polarization state. For at least a second wavelength in a second wavelength range, each of the reflective polarizer and the optical film transmits about 60% of an incident light for each of the first and second polarization states. For at least the first wavelength, optical film has an optical haze and a depolarization ratio. A ratio of the depolarization ratio to the optical haze is less than 0.1.

Abstract: A measurement system is disclosed and includes a light source, a receiver, a measurement subject, and a reflector. The reflector is disposed on an opposite side of the measurement subject than are the light source and the receiver.

Abstract: An optical film for reducing at least one of sparkle and moire in a display system includes a structured first major surface that, in at least a first cross-section in a first plane substantially orthogonal to the optical film, has a sinusoidal shape having a variable pitch of greater than about 0.5 microns. For a substantially normally incident light and blue, green, and red wavelengths that are at least 50 nm apart from each other and are disposed within respective blue, green, and red wavelength ranges, optical transmissions of the optical film versus transmitted angle for the blue, green and red wavelengths have respective blue, green, and red transmission bands disposed at angles greater than about 1 degree and having respective blue, green, and red full width at half maxima (FWHMs), at least two of which at least partially overlap.

Abstract: An optical system for examining an optical characteristic of a test material at at least a first wavelength includes an elongated hollow structure elongated along a length thereof and having one or more walls extending along the length of the hollow structure and defining an elongated chamber therebetween configured to receive the test material. The elongated hollow structure includes at least a first light opening, such that for the at least the first wavelength, the one or more walls have an optical reflectance of greater than about 50% for incident angles of up to at least 40 degrees, and at least one of the at least the first light opening has an optical transmittance of greater than about 50% for at least one incident angle.

Abstract: A gradient permittivity film comprises (a) a first permittivity layer comprising a first continuous matrix of a first material having a first relative permittivity (?r1) and a second component having a second relative permittivity (?r2) dispersed in the first continuous matrix, the first permittivity layer having a first effective layer relative permittivity (?1) and a thickness (T1); And (b) a second permittivity layer having a second effective layer relative permittivity (?2) and a thickness (T2) disposed on the first permittivity layer. T1=0.8(t1) to 1.2(t1), where t 1 = c 4 ? f ? ? 1 ; ? T 2 = 0.8 ( t 2 ) ? to 1.2 ( t 2 ) , where ? t 2 = c 4 ? f ? ? 2 .

Abstract: An optical adhesive including a viscoelastic or elastomeric adhesive layer and a cured polymer layer immediately adjacent the viscoelastic or elastomeric adhesive layer is described. The viscoelastic or elastomeric adhesive layer a refractive index less than 1.570 and the cured polymer layer has a refractive index of at least 1.570. An interface between the viscoelastic or elastomeric adhesive layer and the cured polymer layer is structured. The cured polymer layer has a storage modulus of at least 2000 MPa at 20° C. and a glass transition temperature of no more than 65° C.