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The A*STAR-affiliated researchers contributing to this research are from the Data Storage Institute. For more information please see the Advanced Concepts & Nanotechnology webpage.

Researchers show that a new design element for nanoscale light-bending materials makes them electrically tuneable at room temperature, opening doors to new optical technologies.

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A new optical scanner reduces costs and expands medical imaging applications, enabling doctors to better view and diagnose internal body structures.

A new optical nanoantenna design provides fine control of light emissions from quantum dots, honing their tunability for more robust, energy-efficient optoelectronics.

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The dimensions of the nanoantennas — the disk diameter, disk separation and the pitch of the array — can be altered to suit the metalens’ wavelength range and specific application. For example, disk diameters of 190 and 150 nanometers redirect incoming red light at an angle of 82 degrees. This allowed the team to achieve a numerical aperture of 0.99 in their metalens, making it ideal for high-resolution applications.

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The working principle of an energy meter is based on Faraday’s law of electromagnetic induction. As electrical current flows through a conductor, it generates a magnetic field. Energy meters use this magnetic field to drive a rotating disk or other mechanisms. The rate of rotation is directly proportional to the amount of electricity consumed, allowing the meter to measure energy accurately.

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Energy meter plays a pivotal role in our modern world, ensuring the precise measurement of electrical energy consumption. These devices are critical for both residential and industrial settings, helping us monitor and manage our energy usage effectively. In this comprehensive article, we will delve into the world of energy meters, covering their definition, types, working principles, construction, functions, performance improvement, and factors to consider when selecting one.

The ‘metalens’ created by Paniagua-Domínguez and his colleagues consists of arrays of silicon discs with various diameters on a substrate, each area designed to direct the light at a specific angle. All the areas were engineered to direct light into a specific point — the focus of the lens. The area responsible for giving the lens its high-numerical-aperture comprises pairs of nanometer-scale silicon cylinders, one larger than the other, which act like antennas for visible light. Using silicon rather than a metal reduces losses and makes the concept applicable across a wide range of wavelengths.

“We are exploring more complex geometries to maximize the efficiency of the lens,” says Paniagua-Domínguez. “Plus, seeking other materials to expand the range of frequencies at which the lens works.”

Researchers show that a new design element for nanoscale light-bending materials makes them electrically tuneable at room temperature, opening doors to new optical technologies.

In conclusion, energy meters are indispensable tools for accurately measuring and managing electrical energy consumption. Understanding their types, working principles, construction, functions, performance improvement, and selection criteria empowers consumers and businesses to make informed decisions about energy usage, billing, and conservation. As technology continues to advance, energy meters will play an even more significant role in our efforts to achieve a sustainable energy future.

A new optical nanoantenna design provides fine control of light emissions from quantum dots, honing their tunability for more robust, energy-efficient optoelectronics.

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“Previous attempts to make flat, high-numerical-aperture lenses ended up with devices that were very inefficient at its edges, where the light bends at very large angles,” explains A*STAR scientist Ramón Paniagua-Domínguez. “We proposed a new method to overcome this limitation using nanoantennas.”

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A new optical scanner reduces costs and expands medical imaging applications, enabling doctors to better view and diagnose internal body structures.

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However, high-numerical-aperture systems can be bulky, complex and expensive. And conventional glass-based optics rarely attain a numerical aperture above 0.95. Scientists from the A*STAR Data Storage Institute have now built a simple flat lens with a numerical aperture higher than 0.99.

Choosing the right energy meter is crucial for accurate measurement and efficient energy management. Here are key factors to consider:

High-numerical-aperture optical lenses offer very high resolution and are particularly useful for low-light-intensity applications, such as single-photon optics. The numerical aperture is a measure of the conical angle of light that can be collected by the lens and, reciprocally, how tightly a beam of light can be focused. The larger the numerical aperture, the higher the resolution and the closer the lens can be to the object to be imaged. As the collection angle and, hence the amount of light collected from the object, approaches its theoretical maximum, the numerical aperture increases and gets closer to a value of one, the fundamental maximum for a lens in air.

Simple flat lenses, incorporating nanoscale features, that outperform conventional bulk optics have been fabricated by scientists at A*STAR.

An energy meter, often referred to as an electricity meter or watt-hour meter, is an essential electrical device used to measure the amount of electrical energy consumed by a building, equipment, or electrical circuit. It provides a crucial means for utilities and consumers to accurately track and bill for electricity usage. Energy meters are indispensable tools for ensuring fair billing and promoting energy conservation.