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Shauloff N, Bisht R, Turkulets Y, Manikandan R, Morag A, Lehrer A, Baraban JH, Shalish I, Jelinek R. Multispectral and Circular Polarization-Sensitive Carbon Dot-Polydiacetylene Capacitive Photodetector. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2022:e2206519. [PMID: 36504311 DOI: 10.1002/smll.202206519] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/22/2022] [Indexed: 06/17/2023]
Abstract
Multispectral photodetectors (MSPs) and circularly polarized light (CPL) sensors are important in opto-electronics, photonics, and imaging. A capacitive photodetector consisting of an interdigitated electrode coated with carbon dot/anthraquinone-polydiacetylene is constructed. Photoexcitation of the carbon dots induces transient electron transfer to the anthraquinone moieties, and concomitant change in the film dielectric constant and recorded capacitance. This unique photodetection mechanism furnishes wavelength selectivity that is solely determined by the absorbance of the carbon dots incorporated in the anthraquinone-polydiacetylene matrix. Accordingly, employing an array of polymerized-anthraquinone photodetector films comprising carbon dots (C-dots) exhibiting different excitation wavelengths yielded optical "capacitive fingerprints" in a broad spectral range (350-650 nm). Furthermore, circular light polarization selectivity is achieved through chiral polymerization of the polydiacetylene framework. The carbon dot/anthraquinone-polydiacetylene capacitive photodetector features rapid photo-response, high fidelity, and recyclability as the redox reactions of anthraquinone are fully reversible. The carbon dot/anthraquinone-polydiacetylene platform is inexpensive, easy to fabricate, and consists of environmentally friendly materials.
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Affiliation(s)
- Nitzan Shauloff
- Department of Chemistry, Ben Gurion University of the Negev, Beer Sheva, 8410501, Israel
| | - Rajesh Bisht
- Department of Chemistry, Ben Gurion University of the Negev, Beer Sheva, 8410501, Israel
| | - Yury Turkulets
- School of Electrical Engineering, Ben Gurion University of the Negev, Beer Sheva, 8410501, Israel
| | - Rajendran Manikandan
- Department of Chemistry, Ben Gurion University of the Negev, Beer Sheva, 8410501, Israel
| | - Ahiud Morag
- Department of Chemistry, Ben Gurion University of the Negev, Beer Sheva, 8410501, Israel
| | - Avi Lehrer
- Department of Chemistry, Ben Gurion University of the Negev, Beer Sheva, 8410501, Israel
| | - Joshua H Baraban
- Department of Chemistry, Ben Gurion University of the Negev, Beer Sheva, 8410501, Israel
| | - Ilan Shalish
- School of Electrical Engineering, Ben Gurion University of the Negev, Beer Sheva, 8410501, Israel
| | - Raz Jelinek
- Department of Chemistry, Ben Gurion University of the Negev, Beer Sheva, 8410501, Israel
- Ilse Katz Institute for Nanotechnology, Ben Gurion University of the Negev, Beer Sheva, 8410501, Israel
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Smirnov S, Lioubtchenko DV, Oberhammer J. Single-walled carbon nanotube layers for millimeter-wave beam steering. NANOSCALE 2019; 11:14691-14697. [PMID: 31343028 DOI: 10.1039/c9nr02705j] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
The ability to efficiently transmit and manipulate high-frequency signals poses major challenges resulting in a lack of active and reconfigurable millimeter-wave and terahertz devices that are needed to enable beyond-5G broadband communication systems. Here, thin single-walled carbon nanotube (SWCNT) layers are introduced as a tunable impedance surface for millimeter-waves. Carbon nanotube layers are integrated with dielectric rod waveguides. Their surface impedance, tuned by light, is shown to modify the wave propagation inside the waveguide. A direct application of the effect is a phase shifter, demonstrated experimentally and by numerical simulations. Additionally, an antenna array of two dielectric waveguides, one covered in SWCNTs, is designed and fabricated. The proof-of-concept illustrates optically-controlled beam steering enabled by carbon nanotubes, and directions for further device optimizations are provided. These findings demonstrate thin SWCNT layers as an optically-reconfigurable element, suitable for broadband millimeter-wave communications.
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Affiliation(s)
- Serguei Smirnov
- Department of Micro and Nanosystems, KTH Royal Institute of Technology, Malvinas väg 10, SE-100 44 Stockholm, Sweden.
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