Polarized Light, Revised and Expanded (Optical Science and Engineering)


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Not a Member? Join OSA. Holograms made with metasurfaces could enable fast, compact polarization measurements for spectroscopy, sensing and communications. The new metasurface holograms could be used to create very fast and compact devices for polarization measurements, which are used in spectroscopy, sensing and communications applications. They can be made with standard microelectronics fabrication techniques, enabling mass production, and can be easily integrated into wafer-scale optical systems. Despite these promising features, they are not yet used in many practical applications.

Introduction

Caption: Researchers used a metasurface to generate two overlapping holographic images, one that is left-handed circularly polarized LCP and one that is right-handed circularly polarized RCP. By analyzing the interference of the two images far right , they obtained the amplitude contrast and phase difference between the LCP and RCL components of the incident beam, which can directly identify the polarization state of the light.

In Optica , The Optical Society's journal for high impact research, a multi-institutional group of researchers report using metasurface holograms to effectively and quickly determine polarization at near-infrared to visible wavelengths. The new work represents a step toward functional metasurface-based devices to support a range of applications from telecommunications to chemical analysis.

Although sunlight and most household light sources emit unpolarized light that oscillates in all directions, optical components such as filters can be used to produce polarized light that propagates in just a single plane — typically vertical or horizontal. Analytical instruments such as spectrometers can measure how light polarization changes after interacting with a material to determine its physical properties.

Different light polarizations can also be used to send multiple signals through optical fibers for telecommunications applications. Conventional methods for determining polarization often require multiple measurements, bulky optical setups or precise adjustment of high-quality optical components to indirectly determine the polarization state. In the new work, the researchers instead used a metasurface to determine polarization directly by comparing the amplitude and phase of light waves that are polarized at right angles to themselves.

Organizations

The metasurface generates two overlapping holographic images, one that is left-handed circularly polarized LCP and another that is right-handed circularly polarized RCP. Circularly polarized light features an electric field oscillation plane that rotates to the left or right in a plane perpendicular to the direction of the wave. Key to the new technique was an algorithm called Gerchberg-Saxton, which is widely used in holographic research. The researchers figured out how to modify this algorithm so that it could be used to identify the phase difference between the LCP and RCP components of the incident light in the overlapping holographic images.

The researchers demonstrated their new metasurface holographic approach by using it to measure the polarization states of illuminating light beams with known polarizations. The measured polarization states matched well with the known ones, confirming the effectiveness of the approach.

The metasurface the researchers used is based on the Pancharatnam-Berry phase also known as geometric phase method, which features relative phase responses that do not exhibit any dispersion. This allows the metasurface holograms to work over a broad range of wavelengths. The researchers figured out how to modify this algorithm so that it could be used to identify the phase difference between the LCP and RCP components of the incident light in the overlapping holographic images.

The researchers demonstrated their new metasurface holographic approach by using it to measure the polarization states of illuminating light beams with known polarizations. The measured polarization states matched well with the known ones, confirming the effectiveness of the approach.

Promises to expand use of polarized light for drug screening, surveillance, optical communications

The metasurface the researchers used is based on the Pancharatnam-Berry phase also known as geometric phase method, which features relative phase responses that do not exhibit any dispersion. This allows the metasurface holograms to work over a broad range of wavelengths. Now that they have proved the concept, the researchers plan to improve the efficiency of the method and will compare its performance with conventional commercial instruments used to measure polarization.

Paper: X. Zhang, S. Yang, W. Yue, Q. Xu, C. Tian, X.

Tissue Imaging: Got nerve? Collimated polarized light can tell | Bio Optics World

Zhang, E. Plum, S. Zhang, J.

16 - Class 12 - Physics - Wave Optics - Polarisation

Han, W. Optica is an open-access, online-only journal dedicated to the rapid dissemination of high-impact peer-reviewed research across the entire spectrum of optics and photonics. Published monthly by The Optical Society OSA , Optica provides a forum for pioneering research to be swiftly accessed by the international community, whether that research is theoretical or experimental, fundamental or applied.

First circularly polarized light detector on a silicon chip

Optica maintains a distinguished editorial board of more than 60 associate editors from around the world and is overseen by Editor-in-Chief Alex Gaeta, Columbia University, USA. For more information, visit Optica. Founded in , The Optical Society OSA is the leading professional organization for scientists, engineers, students and business leaders who fuel discoveries, shape real-life applications and accelerate achievements in the science of light. Through world-renowned publications, meetings and membership initiatives, OSA provides quality research, inspired interactions and dedicated resources for its extensive global network of optics and photonics experts.

For more information, visit osa. Patients diagnosed with cancer after skipping appointment more likely to die within a year. New insights into how astrocytes help the brain process information.


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Polarized Light, Revised and Expanded (Optical Science and Engineering) Polarized Light, Revised and Expanded (Optical Science and Engineering)
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Polarized Light, Revised and Expanded (Optical Science and Engineering) Polarized Light, Revised and Expanded (Optical Science and Engineering)
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