11 results about "Absorption (electromagnetic radiation)" patented technology

A method for efficient photocatalysis in which electric charge carriers are energetically excited upon absorption of electromagnetic radiation, characterized in that the charge carriers are separated by a pyroelectric field.

The invention relates to a method for the lithography-based additive manufacturing of a three-dimensional component, in which a beam emitted by an electromagnetic radiation source (3) is focused onto a focal point within a material (2) by means of an optical imaging unit (12) in order to introduce an exposure dose into the material (2), and the focal point is shifted by means of a deflection system positioned upstream of the imaging unit (12) in the beam path, and a volume element of the material (2) located at the focal point is solidified by means of multiphoton absorption, wherein the shifting of the focal point comprises a first movement component (18), namely an in particular continuous shifting along a main path, onto which a second movement component (21), namely a repeated transverse movement running transversely to the first movement component, is superimposed, and the exposure dose is modulated during the transverse movement.

A cooking vessel includes a cooking surface and a lower portion positioned below the cooking surface. A first material is disposed within the lower portion and is in thermal proximity to the cooking surface. The first material increases in temperature upon absorption of electromagnetic radiation. A second material is disposed within the lower portion and in thermal proximity to the cooking surface. An electrical current is induced in the second material upon exposure to an electromagnetic field. Both the first material and the second material are configured to heat the cooking surface of the cooking vessel when used in a microwave oven or on an induction cooktop, respectively.

A communication system is disclosed where information is embedded in the frequency of an optical electromagnetic radiation carrier, and concurrently, information is embedded in the amplitude of the optical electromagnetic radiation carrier. The electromagnetic radiation carrier is then propagated and collected by a receiver. The receiver is composed of a demodulator that can determine frequency of the electromagnetic carrier independently of carrier amplitude. The demodulator then extracts information from the electromagnetic carrier frequency and amplitude. The demodulator utilizes dispersion adjacent to absorption in paramagnetic vapors to determine frequency, and can also measure signal amplitude.

Photosensitive devices and associated methods are provided. In one aspect, for example, a photosensitive imager device can include a semiconductor substrate having multiple doped regions forming at least one junction, a textured region coupled to the semiconductor substrate and positioned to interact with electromagnetic radiation, and an electrical transfer element coupled to the semiconductor substrate and operable to transfer an electrical signal from the at least one junction. In one aspect, the textured region is operable to facilitate generation of an electrical signal from the detection of infrared electromagnetic radiation. In another aspect, interacting with electromagnetic radiation further includes increasing the semiconductor substrate's effective absorption wavelength as compared to a semiconductor substrate lacking a textured region.

This application discloses a method for preparing a MoSe2 / nitrogen-doped expanded graphite composite electromagnetic wave absorbing material. Melamine is used as the nitrogen source, and after mixing and grinding with expandable graphite, nitrogen-doped expanded graphite is obtained by high-temperature annealing. Sodium molybdate dihydrate and selenium powder are dissolved in hydrazine hydrate to obtain solution A. The nitrogen-doped expanded graphite is dispersed in a mixture of deionized water and ethanol to obtain mixture B. Solution A and mixture B are mixed and transferred to a high-pressure reactor for hydrothermal reaction. After filtration, washing, and drying, the composite material is obtained. In this material, MoSe2 is uniformly grown in flower-shaped nanosheets between the layers and on the surface of the three-dimensional porous worm-like nitrogen-doped expanded graphite. The preparation process of this application is simple and low-cost. The resulting composite material achieves a minimum reflection loss of -43.6 dB at a 5% filler content and an effective absorption bandwidth of 8.2 GHz, which can be applied in the fields of radar stealth, electromagnetic compatibility protection, and electromagnetic radiation absorption.

The present invention relates to a photodetector (3) comprising: a longitudinal portion (12) of a waveguide (11) which comprises or is formed by two waveguide segments (12a, 12b), which extend at least substantially parallel to one another in the longitudinal direction and are preferably distanced from one another in the transverse direction, forming a gap (14) between them; and an active element (13), which overlies the longitudinal portion (12) of the waveguide and comprises at least one material or consists of at least one material that absorbs electromagnetic radiation of at least one wavelength and generates an electric photosignal as a result of the absorption, the two waveguide segments (12a, 12b) each being in contact, at least in some portions, on at least one side, in particular on the side facing the active element (14), with a gate electrode (15a, 15b) which preferably comprises silicon or consists of silicon.

In a method for lithography-based generative manufacturing of three-dimensional components, in which at least one beam emitted by an electromagnetic radiation source (2) is focused in succession onto a focal point within a material by means of an illumination device (3), whereby volume elements (13) of the material located at the focal point are each solidified by means of multiphoton absorption, the focal point is displaced in a z direction, wherein the z direction corresponds to the direction of incidence of the at least one beam into the material, wherein the displacement of the focal point in the z direction is carried out by means of at least one acousto-optic deflector (6) arranged in the beam path, in which an acoustic wave is generated, the frequency of which is periodically modulated.

Various embodiments of the present disclosure relate to a semiconductor structure comprising a first substrate comprising a first semiconductor material. A first optical sensor is disposed within the first substrate. The first optical sensor is configured to absorb electromagnetic radiation within a first wavelength range. A second optical sensor is disposed within an absorption structure located beneath the first substrate. The second optical sensor is configured to absorb electromagnetic radiation within a second wavelength range different from the first wavelength range. The absorption structure is located beneath the first optical sensor and comprises a second semiconductor material different from the first semiconductor material.

The present invention relates to a photodetector (3) comprising: a longitudinal portion (12) of a waveguide (11) comprising or formed of two waveguide segments (12a, 12b) extending at least substantially parallel to each other in the longitudinal direction and preferably spaced apart from each other in the transverse direction to form a gap (14) therebetween; and an active element (13) stacked on the longitudinal portion (12) of the waveguide and comprising or composed of at least one material that absorbs electromagnetic radiation of at least one wavelength and generates an electro-optic signal due to absorption, wherein each of the two waveguide segments (12a, 12b) is in contact with a gate electrode (15a, 15b) at least in some portions, on at least one side, particularly on the side facing the active element (14), the gate electrode (15a, 15b) preferably comprising or composed of silicon.