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Related Concept Videos

Fischer Projections02:18

Fischer Projections

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Learning to draw Fischer projections of molecules and understanding their relevance plays a crucial role in the visual depiction of organic molecules. A Fischer projection is a two-dimensional projection on a planar surface to simplify the three-dimensional wedge–dash representation of molecules. This is especially helpful in the case of molecules with multiple chiral centers that can be difficult to draw. Here, all the bonds of interest are represented as horizontal or vertical lines. While...
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Different notations are used to represent the three-dimensional structure of molecules on two-dimensional surfaces. One of the most commonly used representations is the dash-wedge formula. The dashed wedges, solid wedges, and the plane lines indicate the groups situated behind the plane, coming out of the plane, and in the plane, respectively.
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Coordinates and map projections are essential tools in accurately representing the Earth's surface for various applications, ranging from navigation to spatial analysis. The latitude and longitude coordinate system is a universally recognized framework for defining locations. Latitude specifies the distance of a point north or south of the equator, measured in degrees from 0° at the equator to 90° at the poles. Longitude indicates a location's position east or west of the prime meridian,...
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Light Acquisition02:16

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In order to produce glucose, plants need to capture sufficient light energy. Many modern plants have evolved leaves specialized for light acquisition. Leaves can be only millimeters in width or tens of meters wide, depending on the environment. Due to competition for sunlight, evolution has driven the evolution of increasingly larger leaves and taller plants, to avoid shading by their neighbors with contaminant elaboration of root architecture and mechanisms to transport water and nutrients.
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Light as Energy01:35

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The energy required to carry out photosynthesis is light— typically electromagnetic radiation from the sun. The range of all possible wavelengths is known as the electromagnetic spectrum.
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Depth Perception and Spatial Vision01:15

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Depth perception is the ability to perceive objects three-dimensionally. It relies on two types of cues: binocular and monocular. Binocular cues depend on the combination of images from both eyes and how the eyes work together. Since the eyes are in slightly different positions, each eye captures a slightly different image. This disparity between images, known as binocular disparity, helps the brain interpret depth. When the brain compares these images, it determines the distance to an object.
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Updated: Jan 25, 2026

Shaping the Amplitude and Phase of Laser Beams by Using a Phase-only Spatial Light Modulator
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Holographic zoom micro-projection system based on three spatial light modulators.

Di Wang, Chao Liu, Qiong-Hua Wang

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    Summary
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    This study introduces a novel holographic zoom micro-projection system using three spatial light modulators (SLMs) and a liquid lens. The system achieves adjustable zoom micro-projection without chromatic aberration, confirmed by experimental results.

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    Area of Science:

    • Optics
    • Photonics
    • Display Technology

    Background:

    • Micro-projection systems are crucial for various display applications.
    • Achieving zoom functionality without chromatic aberration in holographic displays presents a significant challenge.

    Purpose of the Study:

    • To propose and demonstrate a holographic zoom micro-projection system.
    • To enable adjustable image size and position in holographic displays.
    • To eliminate chromatic aberration in the reconstructed images.

    Main Methods:

    • Utilized three spatial light modulators (SLMs) for phase modulation and hologram display.
    • Incorporated a liquid lens with voltage-controlled focal length via electrowetting.
    • Employed three color lasers, filters, solid lenses, beam splitters, and a prism for light manipulation.

    Main Results:

    • Successfully reconstructed three-color images by illuminating holograms on SLMs.
    • Demonstrated adjustable image position and size by altering liquid lens focal length and holograms.
    • Achieved zoom micro-projection functionality without chromatic aberration.

    Conclusions:

    • The proposed holographic zoom micro-projection system is feasible and effective.
    • The integration of SLMs and a liquid lens offers a robust solution for dynamic holographic displays.