{"id":65097,"date":"2025-05-01T07:37:06","date_gmt":"2025-05-01T07:37:06","guid":{"rendered":"https:\/\/www.europesays.com\/uk\/65097\/"},"modified":"2025-05-01T07:37:06","modified_gmt":"2025-05-01T07:37:06","slug":"torsion-unipolar-barrier-heterojunction-device-simplifies-optical-imaging-and-sensing","status":"publish","type":"post","link":"https:\/\/www.europesays.com\/uk\/65097\/","title":{"rendered":"Torsion unipolar barrier heterojunction device simplifies optical imaging and sensing"},"content":{"rendered":"

\"New<\/p>\n

The practical application of the device as an optical receiver in dual communication coding. Credit: Advanced Materials (2025). DOI: 10.1002\/adma.202500572<\/p>\n

Polarization, along with intensity, wavelength, and phase, is a fundamental property of light. It enhances contrast and resolution in imaging compared to traditional intensity-based methods. On-chip polarization devices rely on complex four-pixel arrays or external polarizers.<\/p>\n

Current solutions face two key challenges: limited spectral response in plasmonic and metasurface-based devices, and difficulty in simultaneously detecting the angle (AoLP) and degree (DoLP) of linear polarization<\/a> in low-dimensional anisotropic materials. Achieving wide-spectrum, high-precision polarization detection remains a critical challenge in the field.<\/p>\n

To address this, a research team led by Prof. Li Liang from the Institute of Solid State Physics, the Hefei Institutes of Physical Science of the Chinese Academy of Sciences, in collaboration with Prof. Zhai Tianyou from Huazhong University of Science and Technology, has developed a novel “torsion unipolar barrier heterojunction” device.<\/p>\n

Their findings were recently published<\/a> in Advanced Materials.<\/p>\n

This innovative device utilizes the unique anisotropic photoelectric properties of two-dimensional PdSe\u2082 to construct a dual absorption layer while fine-tuning the energy band of the intermediate MoS\u2082 barrier layer. This design enables bias-programmable control over carrier transport paths, leading to groundbreaking performance.<\/p>\n

\"New<\/p>\n

Schematic diagram of optical carrier transmission in PdSe2\/MoS2\/PdSe2 vdWH. Credit: Ma Xiaofei<\/p>\n

The device features two key advancements:<\/p>\n

    \n
  1. Bipolar photocurrent behavior at zero bias, allowing direct decoding of polarization-encoded bi-binary communication signals.<\/li>\n
  2. Elimination of the need for auxiliary polarizers, enabling real-time, simultaneous measurement of AoLP and DoLP, overcoming the limitations of traditional four-pixel arrays.<\/li>\n<\/ol>\n

    This research offers a fresh perspective on next-generation on-chip polarization detectors, simplifying device<\/a> structures while enhancing optical information processing, according to the team.<\/p>\n

    More information:<\/strong>
    \n\t\t\t\t\t\t\t\t\t\t\t\tXiaofei Ma et al. Simultaneous AoLP and DoLP Detection in a Bias-Switchable PdSe2\/MoS2\/PdSe2 Heterojunction for Polarization Discrimination, Advanced Materials (2025).     DOI: 10.1002\/adma.202500572<\/a>, advanced.onlinelibrary.wiley.c \u2026 .1002\/adma.202500572<\/a><\/p>\n

    \n\t\t\t\t\t\t\t\t\t\t\t\t\tProvided by
    \n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t    Chinese Academy of Sciences<\/a>
    \n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t    <\/p>\n

    \t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/a>\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/p>\n

    \n\t\t\t\t\t\t\t\t\t\t\t\tCitation<\/strong>:
    \n\t\t\t\t\t\t\t\t\t\t\t\tTorsion unipolar barrier heterojunction device simplifies optical imaging and sensing (2025, April 30)
    \n\t\t\t\t\t\t\t\t\t\t\t\tretrieved 1 May 2025
    \n\t\t\t\t\t\t\t\t\t\t\t\tfrom https:\/\/phys.org\/news\/2025-04-torsion-unipolar-barrier-heterojunction-device.html\n\t\t\t\t\t\t\t\t\t\t\t <\/p>\n

    \n\t\t\t\t\t\t\t\t\t\t\t This document is subject to copyright. Apart from any fair dealing for the purpose of private study or research, no
    \n\t\t\t\t\t\t\t\t\t\t\t part may be reproduced without the written permission. The content is provided for information purposes only.\n\t\t\t\t\t\t\t\t\t\t\t <\/p>\n","protected":false},"excerpt":{"rendered":"The practical application of the device as an optical receiver in dual communication coding. Credit: Advanced Materials (2025).…\n","protected":false},"author":2,"featured_media":65098,"comment_status":"","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[3845],"tags":[75,76,74,71,70,72,53,73,16,15],"class_list":{"0":"post-65097","1":"post","2":"type-post","3":"status-publish","4":"format-standard","5":"has-post-thumbnail","7":"category-physics","8":"tag-materials","9":"tag-nanotech","10":"tag-physics","11":"tag-physics-news","12":"tag-science","13":"tag-science-news","14":"tag-technology","15":"tag-technology-news","16":"tag-uk","17":"tag-united-kingdom"},"share_on_mastodon":{"url":"https:\/\/pubeurope.com\/@uk\/114431436136020528","error":""},"_links":{"self":[{"href":"https:\/\/www.europesays.com\/uk\/wp-json\/wp\/v2\/posts\/65097","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.europesays.com\/uk\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.europesays.com\/uk\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.europesays.com\/uk\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.europesays.com\/uk\/wp-json\/wp\/v2\/comments?post=65097"}],"version-history":[{"count":0,"href":"https:\/\/www.europesays.com\/uk\/wp-json\/wp\/v2\/posts\/65097\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.europesays.com\/uk\/wp-json\/wp\/v2\/media\/65098"}],"wp:attachment":[{"href":"https:\/\/www.europesays.com\/uk\/wp-json\/wp\/v2\/media?parent=65097"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.europesays.com\/uk\/wp-json\/wp\/v2\/categories?post=65097"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.europesays.com\/uk\/wp-json\/wp\/v2\/tags?post=65097"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}