Midinfrared Surface Plasmons in Carbon Nanotube Plasmonic Metasurface

Afinogenov, Boris I.; Kopylova, Daria S.; Abrashitova, Ksenia; Bessonov, Vladimir O.; Anisimov, Anton S.; Dyakov, Sergey A.; Gippius, N. A.; Gladush, Yuriy G.; Fedyanin, Andrey A.; Nasibulin, Albert G.

doi:10.1103/physrevapplied.9.024027

Cited by 16 publications

(7 citation statements)

References 53 publications

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“…Single-walled carbon nanotube (SWCNT) films have been proven to be prospective candidates for numerous applications in many fields of science and technology. Among the most promising examples of SWCNT implementations are transparent electrodes, 1,2 smart textiles, 3,4 ultrasensitive photodetectors, 5,6 highly-efficient solar cells, 7,8 light-emitting diodes, 9,10 and ultrafast lasers for near and midinfrared wavelength ranges. 11,12 All these applications, as well as almost any task related to the development of devices based on SWCNT films, strongly require a rapid, versatile, and preferably contactless method to determine the film thicknesses and their optical properties.…”

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confidence: 99%

“…However, it does not guarantee good reliable results, as was shown by Barnes et al, where an agreement with an experimental absorption spectrum was demonstrated only within 20%. 15 Besides, the AFM methods are not applicable in the case of freestanding films used in ultrasensitive photodetectors, 5 efficient ultrasound loudspeakers, 36 and extreme UV protective membranes, 37 which makes the preliminary thickness assessment a difficult (or even impossible) task. Another approach proposed by Kuwahara et al 38 is based on thick film optical constants applied as a reference for thin films.…”

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confidence: 99%

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Express determination of thickness and dielectric function of single-walled carbon nanotube films

Ermolaev

Tsapenko

Volkov

et al. 2020

Applied Physics Letters

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Single-walled carbon nanotube (SWCNT) films are promising building blocks for diversified applications in electronics, photovoltaics, and photonics. However, their electrical and optical engineering is still a challenging task owing to multiple obstacles, including the absence of fast and easy-to-use methods for the determination of SWCNT film properties. Here, we present a rapid, contactless, and universal technique for accurate estimation of both SWCNT film thicknesses and their dielectric functions. The approach combines broadband optical absorbance and highly sensitive spectroscopic ellipsometry measurements. The observed linear dependence of the film thickness on its absorbance at 550 nm provides a time-effective and contactless method of thickness assignment, which is of significant importance to the practical implementation of SWCNT films in optoelectronic devices. Additionally, our approach revealed that a simple procedure of film densification allows to controllably alter the dielectric response by at least 40% and, thus, to add extra fine-tuning capabilities during material property engineering. Therefore, this express technique as a whole offers an advanced metrological tool for current and next-generation SWCNT-based devices.

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confidence: 99%

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confidence: 99%

Express determination of thickness and dielectric function of single-walled carbon nanotube films

Ermolaev

Tsapenko

Volkov

et al. 2020

Applied Physics Letters

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“…The high optical contrast that we achieved using the pristine SWCNT membrane, is due to both the low diffuse and suppressed specular reflectance. A simple model of a scalar complex local dielectric permittivity can be applied for the theoretical description of specular reflectance (Rs) and transmittance (T) of the densified SWCNT membrane in the wavelength range from near UV to infrared [42]. We have calculated Rs and T using dispersion relation of refractive index and extinction coefficient, determined from the ellipsometry data, by means of Fresnel equations (for additional details, see Supporting Information, Section 6).…”

Section: Resultsmentioning

confidence: 99%

Single-walled carbon nanotube membranes as non-reflective substrates for nanophotonic applications

et al. 2020

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We demonstrate that single-walled carbon nanotube (SWCNT) membranes can be successfully utilized as nanometer-thick substrates for enhanced visualization and facilitated study of individual nanoparticles. As model objects, we transfer optically resonant 200 nm silicon nanoparticles onto pristine and ethanol-densified SWCNT membranes by the femtosecond laser printing method. We image nanoparticles by scanning electron and bright-field optical microscopy, and characterize by linear and Raman scattering spectroscopy. The use of a pristine SWCNT membrane allows to achieve an order-of-magnitude enhancement of the optical contrast of the nanoparticle bright field image over the results shown in the case of the glass substrate use. The observed optical contrast enhancement is in agreement with the spectrophotometric measurements showing an extremely low specular reflectance of the pristine membrane (≤0.1%). Owing to the high transparency, negligibly small reflectance and thickness, SWCNT membranes offer a variety of perspective applications in nanophotonics, bioimaging and synchrotron radiation studies.

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“…Single-walled carbon nanotubes (SWNTs) and fullerenes are well-known nanoscale materials with plasmonic activity within the near and mid-infrared − and ultraviolet regions, respectively. Simulation of the electronic absorption spectra of large carbon nanotubes and fullerenes is computationally very costly, so that we have employed in this work the pseudo-π approach to investigate the electronic excitation modes involving the π-electron system in the SWNTs and fullerenes listed in Table .…”

Section: Results and Discussionmentioning

confidence: 99%

Detecting Molecular Plasmons by Means of Electron Density Descriptors

2019

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Even though collective electronic excitations in extended systems, also called plasmons, can be easily distinguished from single-electron excitations using classical and quantum electromagnetic theory, they are elusive at the molecular scale. Thus, different schemes have been recently proposed to quantify the plasmonicity at molecular scale using classical models and electronic structure quantum methods. The most successful approaches rely on the role played by the electron−electron kernel in the system's response function. Thus, plasmonic character in finite systems has been associated with excitation modes strongly dependent on the electron−electron kernel, whereas those almost independent are considered single-electron excitations. In this work, we explore an alternative way to distinguish between plasmons and single-electron excitations at the molecular scale, based on the analysis of the eigenvalues of the difference density matrix obtained from time-dependent density functional or Hartree−Fock theories. Summation of these eigenvalues represents the electron population effectively promoted from the occupied to the virtual orbital bands when the molecule is excited by electromagnetic radiation. Its value is exactly 1 for an ideal single-electron excitation and significantly exceeds this reference value in the case of plasmons. Such deviation is associated with the emergence of large electronic deexcitation terms, which are known to be crucial to represent plasmon modes correctly. Advantages and disadvantages of this procedure over those previously proposed are also discussed.

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Midinfrared Surface Plasmons in Carbon Nanotube Plasmonic Metasurface

Cited by 16 publications

References 53 publications

Express determination of thickness and dielectric function of single-walled carbon nanotube films

Express determination of thickness and dielectric function of single-walled carbon nanotube films

Single-walled carbon nanotube membranes as non-reflective substrates for nanophotonic applications

Detecting Molecular Plasmons by Means of Electron Density Descriptors

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