Electrically Tunable Filter for Controlling Transmitted Light Intensity

Simple SummaryContent extracted from patent full text and abstract with AI.

This invention is a device that can control how much electromagnetic radiation (such as light) passes through it, using a special phenomenon called extraordinary transmission. The device uses a membrane made of at least two different layers: one layer is more electrically conductive, and another is mechanically stronger. By applying an electrical voltage, the membrane can switch between positions that either let light pass through or block it.

Use CasesContent extracted from patent full text and abstract with AI.

• Controllable optical filters in cameras or sensors
• Smart windows that adjust transparency for lighting or privacy
• Display technologies with dynamic light control
• Sensors that regulate exposure to electromagnetic radiation
• Precision scientific instruments needing adjustable light transmission

BenefitsContent extracted from patent full text and abstract with AI.

• Precise and reversible control of light or electromagnetic transmission
• Improved durability and mechanical strength through membrane design
• Low power operation achieved with electrical switching
• Potential for miniaturization and integration into micro- or nano-optical systems
• Enhanced functionality compared to traditional static optical filters

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Inventors & Applicants

Patent Abstract

A device for controlling an intensity of a transmitted portion of electromagnetic radiation incident on the device by means of extraordinary transmission is shown. The device comprises a substrate and a membrane, wherein the membrane has at least two layers, wherein a first of the at least two layers has a higher electrical conductivity than a second layer of the at least two layers and wherein the second layer of the at least two layers has a higher lower yield strength and/or a higher tensile strength than the first layer of the at least two layers. Furthermore, at least the first layer has perforations for the extraordinary transmission. By changing an electrical voltage between the membrane and the substrate, the membrane can be switched between a first position, in which the membrane is arranged at a first distance from the substrate and in which the incident electromagnetic radiation is transmitted through the membrane and the substrate, and a second position, in which the membrane is arranged at a second distance from the substrate and the incident electromagnetic radiation is prevented from transmission through the substrate and the membrane.