English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

Although the detection of light at terahertz (THz) frequencies is importantfor a large range of applications, current detectors typically have severaldisadvantages in terms of sensitivity, speed, operating temperature, andspectral range. Here, we use graphene as a photoactive material to overcome allof these limitations in one device. We introduce a novel detector for terahertzradiation that exploits the photothermoelectric (PTE) effect, based on a designthat employs a dual-gated, dipolar antenna with a gap of 100 nm. Thisnarrow-gap antenna simultaneously creates a pn junction in a graphene channellocated above the antenna and strongly concentrates the incoming radiation atthis pn junction, where the photoresponse is created. We demonstrate that thisnovel detector has an excellent sensitivity, with a noise-equivalent power of80 pW-per-square-root-Hz at room temperature, a response time below 30 ns(setup-limited), a high dynamic range (linear power dependence over more than 3orders of magnitude) and broadband operation (measured range 1.8-4.2 THz,antenna-limited), which fulfills a combination that is currently missing in thestate-of-the-art detectors. Importantly, on the basis of the agreement weobtained between experiment, analytical model, and numerical simulations, wehave reached a solid understanding of how the PTE effect gives rise to aTHz-induced photoresponse, which is very valuable for further detectoroptimization.

Fast and Sensitive Terahertz Detection Using an Antenna-Integrated Graphene pn Junction