CC BY
1Optical characterization of individual single-walled carbon
nanotubes
F. Maksimov12*, A. Goldt3, S. Dozmorov3, Yu. Gladush3, A. Nasibulin3, A. Chernov1,2
1-Russian Quantum Center, 30, Bolshoy Bulvar, Building 1, Skolkovo Innovative Center, Moscow, Russian
Federation
2- Center for Photonics and 2D Materials, Moscow Institute of Physics and Technology (MIPT), Dolgoprudny,
Russian Federation
3- Skolkovo Institute of Science and Technology, Bolshoy Boulevard 30, bd. 1, Moscow, 121205, Russian
Federation
Single-walled carbon nanotubes (SWCNTs) are promising low-dimensional material with many applications in quantum technologies. One of the applications that stems from the optical properties of SWCNTs [1,2] is using them as a basis for a single photon source. The main advantages of such emitters are the possibility of obtaining single photons at room temperature, as well as the possibility of choosing the wavelength of emission in the near infrared range by selecting the chirality of the nanotube, which allows, for example, to tune the emitters to the wavelength of telecommunication networks 1550 nm [3]. Such sources are necessary for quantum computing on photons and also for quantum communication. Here we investigate created by aerosol method [4] low-concentration nanotubes deposited on sapphire substrates using resonant Raman spectroscopy and detect the photoluminescence response in the near-IR range. The measurements were performed with a tunable CW laser with a microscope objective (Mitutoyo x100 NIR) and a spot size of about 1 ^m. The nanostage (MadCityLabs Nano T-225) was used for mapping and the signal was collected with a spectrometer (Horiba iHR 320 with Synapse plus/Symphony II detector). As a result, a map of G-band Raman peak signal of a sample was obtained. Further the photoluminescence mapping of functionalized nanotubes was performed. Functionalization of SWCNTs with aryl groups allows the creation of localized sp3 defects on the surface of the nanotube and increases the quantum efficiency of the photoluminescence, which is necessary for the subsequent creation of a single-photon source [5]. Mapping of a single functionalized nanotube allows to determine the position of the defect and finally to integrate them into resonant nanostructures that provide further increase of the photoluminescence efficiency. Unambiguous detection, characterization and further measurement of optical properties allow to reveal the possibility of implementation of individual SWCNTs as a single-photon source.
[1] V.A. Eremina, et al, Separation and optical identification of semiconducting and metallic single-walled carbon nanotubes, Physica status solidi (b), 254.5, (2017).
[2] A.I. Chernov, E.D. Obraztsova, Metallic single-wall carbon nanotubes separated by density gradient ultracentrifugation, Physica status solidi (b), 246.11-12, (2009).
[3] X. He, et al, Tunable room-temperature single-photon emission at telecom wavelengths from sp3 defects in carbon nanotubes, Nature Photonics, 11.9, (2017).
[4] D.A. Ilatovskii, et al, Photophoretic deposition and separation of aerosol-synthesized single-walled carbon nanotubes, Carbon, (2023).
[5] J. Zaumseil, Luminescent Defects in Single-Walled Carbon Nanotubes for Applications, Advanced Optical Materials, 10.2, (2022).
