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- W4309134826 abstract "For terahertz (THz) wave applications, tunable and rapid modulation is highly required. When studied by means of optical pump-terahertz probe spectroscopy, single-walled carbon nanotubes (SWCNTs) thin films demonstrated ultrafast carrier recombination lifetimes with a high relative change in the signal under optical excitation, making them promising candidates for high-speed modulators. Here, combination of SWCNTthin films and stretchable substrates facilitated studies of the SWCNT mechanical properties under strain,and enabled the development of a new type of an opto-mechanical modulator. By applying a certain strain to the SWCNT films, the effective sheet conductance and therefore modulation depth can be fine-tuned to optimize the designed modulator. Modulators exhibited a photoconductivity change of 3-4 orders of magnitude under the strain due to the structural modification in the SWCNT network. Stretching was used to control the THz signal with a modulation depth of around 100 % without strain and 65 % at a high strainoperation of 40 %. The sensitivity of modulators to beam polarisation is also shown, which might also come in handy for the design of a stretchable polariser. Our results give a fundamental grounding for the design of high-sensitivity stretchable devices based on SWCNT films." @default.
- W4309134826 created "2022-11-23" @default.
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- W4309134826 date "2022-11-14" @default.
- W4309134826 modified "2023-09-27" @default.
- W4309134826 title "Ultrafast opto-mechanical terahertz modulators based on stretchable carbon nanotube thin films" @default.
- W4309134826 doi "https://doi.org/10.48550/arxiv.2211.07312" @default.
- W4309134826 hasPublicationYear "2022" @default.
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