Abstract: A device includes a host medium having a first refractive index value; a first layer comprising a first dielectric material having a second refractive index value, wherein the second refractive index value is greater than the first refractive index value, and wherein the first layer comprises a first step structure at a boundary between the first layer and the host medium; and a second layer comprising a second dielectric material and comprising a second step structure, the second layer having a third refractive index value higher than the first refractive index value of the host medium, wherein the second step structure is stacked on the first step structure, and, in response to an incident electromagnetic wave reaching the device, a first nanojet beam generated by the first step structure and a second nanojet beam generated by the second step structure are combined and focused around a first focusing point.

Abstract: A method of bonding layers of dielectric materials includes providing a surface one of the layers with microscale- and/or nanoscale-size bonding elements forming contact points of the layers and bringing a layer of the layers into a mutual position according to an intended use. The method also includes illuminating the layer whose surface is provided with bonding elements by an incident electromagnetic wave, the propagation direction of which is substantially orthogonal to the one of the layers, and whose wavelength is selected depending on an absorption spectrum of a material forming the one of the layers and generating condensed optical beams within said bonding elements or close to a tip of said bonding elements intended to be in contact with the other layer. The method further includes heating and melting the bonding elements by high-intensity focal spots formed by said generated optical beams and maintaining the layers into a mutual position until and bonding of the layers.

Abstract: A diffraction grating includes a plurality of grating unit cells positioned in a periodic array on a substrate surface. In cross-section, a grating unit cell includes a homogeneous dielectric host medium with a first refractive index n1, embedding at least a first block of a first dielectric material with a second refractive index n2, a side edge of which is in direct contact with at least a second block of a second dielectric material with a third refractive index n3. Both the first block and the second block have a trapezoidal cross-section. The plurality of grating unit cells provides a non-symmetrical response for positive first diffraction order and negative first diffraction order based on nanojet hot spot positions, the nanojets being generated at edges between dielectric materials with different refractive indexes.

Abstract: The present disclosure concerns an image sensor comprising a set of pixels, wherein each pixel of the set comprises a first and a second element, the first element comprising a photodiode module unit, and the second element being an element for filtering color and focusing incident light into said first element. The image sensor further comprises at least two consecutive pixels from the set of pixels, for which first elements are put side by side, and wherein the image sensor comprises a gap between second elements of said at least two consecutive pixels.

Abstract: An optical device forming an outgoing electromagnetic wave from an incident electromagnetic wave comprises at least one unit cell (UC), comprising: at least two subwavelength optical elements (1, 2), each of them belonging to a different set (MSI, MS2) of subwavelength optical elements, a set of subwavelength optical elements being characterized by a type of optical response to an incident electromagnetic wave; means (21) enabling selective excitation of all subwavelength optical elements belonging to a given set, in response to an electromagnetic wave (20) incident on said unit cell.

Abstract: A device for forming at least one focused beam in a near-field zone, from an electromagnetic wave incident on the device, is remarkable in that it comprises at least one layer of dielectric material comprising at least partially at least one cavity, the at least one cavity being filled in with a medium having a refractive index lower than that of the dielectric material. The at least one cavity is targeted to be cylindrical or cone-shaped and comprises at least one base surface, defined with respect to an arrival direction of the electromagnetic wave, and at least one lateral surface.

Abstract: An optical device forming an outgoing electromagnetic wave from an incident electromagnetic wave is disclosed. Such a device comprises at least one unit cell comprising: —at least two optical elements, an optical element being characterized by a type of optical response to said incident electromagnetic wave; —selection means enabling selective excitation of at least one optical element among the at least two optical elements, in response to said incident electromagnetic wave as a function of a wavelength of said incident electromagnetic wave, wherein said selection means comprise at one nanojet-based dielectric deflector compound of at least two dielectric material having different refractive indexes, and wherein said optical elements are placed at a distance from said nanojet-based dielectric deflector.

Abstract: An optically-transparent device (100) is disclosed which comprises a main part (10) of dielectric material having a refractive index n2, said device being configured for forming a field intensity distribution in a near zone of said device from electromagnetic waves incidentally illuminating said device, when said device is embedded into a dielectric material having a refractive index n1 lower than said refractive index n2. Said device (100) further comprises at least one insert (11) of dielectric material having a refractive index n3 higher than said refractive index n2, said at least one insert being at least partly inserted into said main part, said refractive index n1 being different from said refractive index n3, and wherein Formula (I) with W2 being a half width of said insert and Formula (II), Formula (III) with W1 being a half width of said main part and Formula (IV), with ? being the wavelength of the electromagnetic wave propagating in the dielectric material having refractive index n1.

Abstract: The present disclosure concerns a device for forming a field intensity pattern in the near zone, from electromagnetic waves which are incident on said device. Notably, such a device allows confining electromagnetic waves, which are incident on the device, into beams of radiation in the near zone. It comprises at least one layer of dielectric material, which surface has at least one abrupt change of level forming a step. A lower and lateral part of said surface with respect to said step is in contact with a substance having a refractive index lower than that of said dielectric material. For an incident electromagnetic wave impinging upon the device in the vicinity of such a step, the corresponding step of index it encounters produces a complex electromagnetic phenomenon, which allows generating low-dispersive condensed beams and specific field patterns in the near zone.

Abstract: A device for shielding a sub-wavelength-scale object from an electromagnetic wave incident on the device. The device includes a layer of dielectric material, a surface of which has a change of level forming a step. The step is in contact with a medium having a refractive index that is lower than a refractive index of the dielectric material. The sub-wavelength-scale object is located within the device in a quiet zone where an electromagnetic field intensity is below a threshold, the quiet zone extending above said surface, in a vicinity of the step, in a direction of incidence of said incident electromagnetic wave.

Abstract: The present disclosure concerns a device for forming a field intensity distribution in the near zone, from a propagating electromagnetic waves which are incident on said device. The device comprises: at least one layer of dielectric material, having a first refractive index n1 with a surface having at least one abrupt change of level forming a step; an element having a second refractive index n2 lower than said first refractive index n1, which is in contact with said step; and wherein said step generates a beam which is tilted compared to a propagation direction of said electromagnetic waves, and said beam having a length comprised between ½?_1 to 10?_1, with ?_1 being a wavelength of said electromagnetic waves in said dielectric material.

Abstract: It is proposed an organic light emitting diode (OLED) cell, comprising a cathode, an anode, the anode being positioned on a substrate, and wherein the organic light emitting diode cell further comprises between said cathode and said anode, an emissive layer and an conductive layer, that generate light when a difference of potential occurs between said cathode and said anode. The organic light emitting diode (OLED) cell further comprises a diffusion layer comprising a set of right circular hollow cylinders, wherein each right circular hollow cylinder being defined by at least a parameter R, named an external radius, and a parameter r, named an internal radius, wherein said parameter R is comprised in a first range [ ? - 30 100 ? ? ; ? + 30 100 ? ? ] with ? being a wavelength of an electromagnetic wave generated by said organic light emitting diode (OLED) cell, and wherein said parameter r is defined such that in a 1 - ( r R ) 2 is comprised in a second range [0.6; 0.

Abstract: In one embodiment of the disclosure, it is proposed a diffraction grating for diffracting light comprising a substrate and a plurality of grating unit cells positioned on the substrate surface. The grating unit cells form a periodic array of grating unit cells which are parallel to each other on said substrate surface or are along a same axis. The diffraction grating is associated with a three-dimensional Cartesian coordinates system defined by axis x, y and z, wherein the z-axis being normal to said diffraction grating.

Abstract: A device for forming at least one focused beam in a near-field zone, from an electromagnetic wave incident on the device, is remarkable in that it comprises at least one layer of dielectric material comprising at least partially at least one cavity, the at least one cavity being filled in with a medium having a refractive index lower than that of the dielectric material. The at least one cavity is targeted to be cylindrical or cone-shaped and comprises at least one base surface, defined with respect to an arrival direction of the electromagnetic wave, and at least one lateral surface.

Abstract: It is proposed an organic light emitting diode (OLED) cell, comprising a cathode, an anode, the anode being positioned on a substrate, and wherein the organic light emitting diode cell further comprises between said cathode and said anode, an emissive layer and an conductive layer, that generate light when a difference of potential occurs between said cathode and said anode.

Abstract: The present disclosure concerns a device for forming a field intensity distribution in the near zone, from a propagating electromagnetic waves which are incident on said device. The device comprises: at least one layer of dielectric material, having a first refractive index n1 with a surface having at least one abrupt change of level forming a step; an element having a second refractive index n2 lower than said first refractive index n1, which is in contact with said step; and wherein said step generates a beam which is tilted compared to a propagation direction of said electromagnetic waves, and said beam having a length comprised between ½ ?_1 to 10?_1, with ?_1 being a wavelength of said electromagnetic waves in said dielectric material.

Abstract: The present disclosure concerns an image sensor comprising a set of pixels, wherein each pixel of the set comprises a first and a second element, the first element comprising a photodiode module unit, and the second element being an element for filtering color and focusing incident light into said first element. The image sensor further comprises at least two consecutive pixels from the set of pixels, for which first elements are put side by side, and wherein the image sensor comprises a gap between second elements of said at least two consecutive pixels.

Abstract: Some embodiments relate to a device for simulating characteristics of human tissues in electromagnetic dosimetry. The device includes a substrate bearing a metallised shielding, a layer of a dielectric material arranged on or preferentially beneath the substrate and the device including a plurality of openings made in the shielding and at least one array of sensors in the layer of dielectric material.

Abstract: The present disclosure concerns a device for generating and guiding nanojets beams from an incident electromagnetic wave on said device.

Abstract: An optical device forming an outgoing electromagnetic wave from an incident electromagnetic wave comprises at least one unit cell (UC), comprising: at least two subwavelength optical elements (1, 2), each of them belonging to a different set (MSI, MS2) of subwavelength optical elements, a set of subwavelength optical elements being characterized by a type of optical response to an incident electromagnetic wave; means (21) enabling selective excitation of all subwavelength optical elements belonging to a given set, in response to an electromagnetic wave (20) incident on said unit cell.