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UV–Vis Spectrometers

UV–Vis Spectrometers

The absorbance of UV and visible (UV–visible) radiations is measured using a UV–visible spectrophotometer. Deuterium lamps, which emit UV radiation, and tungsten lamps, which produce radiation in the visible region, are used as light sources in UV–visible spectrophotometers. A monochromator or prism is used for diffraction grating, i.e., to split the incoming radiation into different wavelengths. A system of slits is used to focus the desired wavelength on the sample cell.

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Simulation, Fabrication and Characterization of THz Metamaterial Absorbers

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Published on: December 27, 2012

Multiwavelength Achromatic Deflector in the Visible Using a Single-Layer Freeform Metasurface.

Taewon Choi¹, Chulsoo Choi^1,2, Junseo Bang¹

¹Inter-University Semiconductor Research Center, School of Electrical and Computer Engineering, Seoul National University, 1 Gwanakro, Gwanak-Gu, Seoul 08826, Republic of Korea.

|August 27, 2024

Summary

This summary is machine-generated.

This study introduces a new single-layer metasurface for chromatic aberration-free beam deflection in visible light. This innovative optical element simplifies fabrication and offers high efficiency for advanced optical systems.

Keywords:

achromatic devices beam steering dielectric metasurface freeform metasurface multifunctional metasurface topology optimization

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Area of Science:

Optics and Photonics
Metamaterials Science
Nanotechnology

Background:

Conventional optical deflectors like prisms and mirrors face limitations in form factor and chromatic aberration.
Metasurfaces offer potential but often operate in the near-infrared or require complex multilayer fabrication.

Purpose of the Study:

To develop a single-layer metasurface for multiwavelength, chromatic aberration-free deflection across the visible spectrum.
To overcome fabrication challenges associated with existing metasurface technologies.

Main Methods:

Employed a robust freeform design strategy for simplified fabrication of a single-layer metasurface.
Utilized coupled Bloch mode analysis to understand physical properties.
Selected specific diffraction orders for red, green, and blue wavelengths to achieve identical wavelength-diffraction-order products.

Main Results:

Achieved multiwavelength chromatic aberration-free deflection at a consistent angle of 41.3° for visible light.
Demonstrated high deflection efficiency.
Experimental fabrication and characterization validated the metasurface's effectiveness.

Conclusions:

The proposed single-layer metasurface offers a practical solution for chromatic aberration-free beam deflection.
This technology has significant potential for applications in augmented reality/virtual reality (AR/VR), digital cameras, and other high-quality optical systems.