Fano Resonances in the Midinfrared Spectra of Single-Walled Carbon Nanotubes

Lapointe, François; Gaufrès, Étienne; Tremblay, Isabelle; Tang, Nathalie; Martel, Richard; Desjardins, P.

doi:10.1103/physrevlett.109.097402

Cited by 19 publications

(27 citation statements)

References 29 publications

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“…In addition to plexcitons, these plasmon resonances in strips of aligned SWCNTs can strongly couple with other quasi-particles, such as phonons. Falk et al showed strong coupling between longitudinal optical phonons in SiO 2 substrates (attenuation peak ν 1 in figure 14 a ), infrared-active E 1 and E 1 u phonons in CNTs [112,113] (attenuation peak ν 2 in figure 14 a ) and plasmon resonances (attenuation peak ν 3 in figure 14 a ), by putting patterned strips with various L of aligned SWCNT films on SiO 2 substrates. The strong coupling enhances usually weak infrared-active phonons and leads to an asymmetric lineshape, which can be fit very well with a Fano resonance formula [111], as shown in figure 14 b .…”

Section: Plasmon Resonances and Hybridization In Patterned Aligned Simentioning

confidence: 99%

Science and applications of wafer-scale crystalline carbon nanotube films prepared through controlled vacuum filtration

Gao

Kono

2019

R. Soc. open sci.

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Carbon nanotubes (CNTs) make an ideal one-dimensional (1D) material platform for the exploration of novel physical phenomena under extremely strong quantum confinement. The 1D character of electrons, phonons and excitons in individual CNTs features extraordinary electronic, thermal and optical properties. Since their discovery in 1991, they have been continuing to attract interest in various disciplines, including chemistry, materials science, physics and engineering. However, the macroscopic manifestation of 1D properties is still limited, despite significant efforts for decades. Recently, a controlled vacuum filtration method has been developed for the preparation of wafer-scale films of crystalline chirality-enriched CNTs, and such films have enabled exciting new fundamental studies and applications. In this review, we will first discuss the controlled vacuum filtration technique, and then summarize recent discoveries in optical spectroscopy studies and optoelectronic device applications using films prepared by this technique.

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Section: Plasmon Resonances and Hybridization In Patterned Aligned Simentioning

confidence: 99%

Science and applications of wafer-scale crystalline carbon nanotube films prepared through controlled vacuum filtration

Gao

Kono

2019

R. Soc. open sci.

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“…By comparing the nanotubes' spectra to spectra of graphene nanoribbons on SiO2, we identify ν3 with the 1168 cm -1 the longitudinal optical (LO) phonon in the SiO2 substrate [16,20]. The ν2 resonance at 1590 cm -1 corresponds to the infrared-active E1 and E1u phonon modes [21,22] of carbon nanotubes. These phonon modes, though closely related to the strong G-band Raman modes of nanotubes [23], are ordinarily very weak spectroscopic features.…”

Section: Main Textmentioning

confidence: 99%

Coherent Plasmon and Phonon-Plasmon Resonances in Carbon Nanotubes

Falk¹,

Chiu

Farmer³

et al. 2017

Phys. Rev. Lett.

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Carbon nanotubes provide a rare access point into the plasmon physics of one-dimensional electronic systems. By assembling purified nanotubes into uniformly sized arrays, we show that they support coherent plasmon resonances, that these plasmons enhance and hybridize with phonons, and that the phonon-plasmon resonances have quality factors as high as 10. Because coherent nanotube plasmonics can strengthen light-matter interactions, it provides a compelling platform for surface-enhanced infrared spectroscopy and tunable, high-performance optical devices at the nanometer scale. Main textPlasmons in carbon nanotubes [1][2][3][4][5] comprise longitudinal charge oscillations coupled to infrared or terahertz optical fields. They can either propagate [3][4][5] or be confined to FabryPérot resonators by reflections at the nanotube ends [6][7][8][9][10] (Fig. 1(a)). Propagation losses are low [3], and the resonant frequencies and absorption coefficients can be controlled via the length [8,10] and doping level [7,9] of the nanotubes. The intense concentration of electromagnetic fields deriving from the nanotubes' one dimensionality allows the plasmons both to confine light to the nanometer scale and to enhance light-matter interactions by Purcell factors that are predicted to be as high as 10 6 [5].At infrared frequencies, nanotube plasmonics could lead to highly sensitive absorption spectroscopy through surface enhanced infrared absorption (SEIRA) [11][12][13]. At terahertz frequencies, it could enable tunable lasers and receivers for use in terabit-per-second wireless communications [14][15][16]. Ultra-broadband nanotube plasmonic circuitry could be naturally integrated with high-performance nanotube transistors.However, nanotube plasmonics has been frustrated by the material quality of nanotube films. In inhomogeneous nanotube films, with a broad distribution of lengths, diameters and/or doping levels, plasmons resonating at different frequencies quickly lose phase coherence with each other, leading to fast dissipation. The quality (Q) factor, which is the quotient of the resonant angular frequency and the dissipation rate, is therefore low. To date, this inhomogeneity has limited observations of nanotube plasmon resonators to the incoherent Q ≪ 1 regime [6][7][8][9][10]. Because dissipation constrains nearly all applications of plasmonics, the demonstration of high Q * Contact: alfalk@us.ibm.com 2 resonators would provide crucial evidence that nanotubes are a technologically viable plasmonic material.In this work, we show that coherent nanotube plasmon and phonon-plasmon resonances can have ensemble Q factors as high as 10. The key to our demonstration is our exceptionally uniform nanotube films, which we develop using Langmuir-Schaeffer techniques [17]. We conservatively estimate that our nanotube resonators confine an electromagnetic field whose free-space wavelength (λ0) is 8 µm to a mode volume (V) of 0.002 µm 3 . With this combination of Q and optical concentration (λ / = 300,000), the Purcell factor by w...

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“…[ 22 ] propose that this effect can be due to the Fano resonance of diamond Raman mode and some continuum of modes connected to the conductive states on the nanodiamond surface. It seems that this behavior is not limited to diamond as similar Fano resonances at the phonon frequency were observed in doped single-walled carbon nanotubes [ 43 ].…”

Section: Discussionmentioning

confidence: 67%

Size-Dependent Thermal Stability and Optical Properties of Ultra-Small Nanodiamonds Synthesized under High Pressure

et al. 2022

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Diamond properties down to the quantum-size region are still poorly understood. High-pressure high-temperature (HPHT) synthesis from chloroadamantane molecules allows precise control of nanodiamond size. Thermal stability and optical properties of nanodiamonds with sizes spanning range from <1 to 8 nm are investigated. It is shown that the existing hypothesis about enhanced thermal stability of nanodiamonds smaller than 2 nm is incorrect. The most striking feature in IR absorption of these samples is the appearance of an enhanced transmission band near the diamond Raman mode (1332 cm−1). Following the previously proposed explanation, we attribute this phenomenon to the Fano effect caused by resonance of the diamond Raman mode with continuum of conductive surface states. We assume that these surface states may be formed by reconstruction of broken bonds on the nanodiamond surfaces. This effect is also responsible for the observed asymmetry of Raman scattering peak. The mechanism of nanodiamond formation in HPHT synthesis is proposed, explaining peculiarities of their structure and properties.

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Fano Resonances in the Midinfrared Spectra of Single-Walled Carbon Nanotubes

Cited by 19 publications

References 29 publications

Science and applications of wafer-scale crystalline carbon nanotube films prepared through controlled vacuum filtration

Science and applications of wafer-scale crystalline carbon nanotube films prepared through controlled vacuum filtration

Coherent Plasmon and Phonon-Plasmon Resonances in Carbon Nanotubes

Size-Dependent Thermal Stability and Optical Properties of Ultra-Small Nanodiamonds Synthesized under High Pressure

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