Single-Molecule Continuous-Wave Terahertz Rectification Spectroscopy and Microscopy

Chen, Siyu; Shi, Wenlu; Ho, W.

doi:10.1021/acs.nanolett.3c00271

Cited by 6 publications

(3 citation statements)

References 30 publications

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“…Considering: (i) the area per molecule on the surface (as estimated from the calculated geometry optimization), and (ii) the estimated C-AFM tip contact surface (see below), we estimate N, the number of molecules contacted under the C-AFM tip, as follows. As usually reported in literature [13][14][15][16] the contact radius, a, between the C-AFM tip and the SAM surface, and the SAM elastic deformation, δ, are estimated from a Hertzian model: These parameters for the present SAM are not known and, in general, they are not easily determined in such a monolayer material. Thus, we consider the value of an effective Young modulus of the SAM E*SAM ≈ 38 GPa as determined for the "model system" alkylthiol SAMs from a combined mechanic and electron transport study.…”

Section: Loading Force and C-afm Tip Contact Areamentioning

confidence: 99%

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Molecular Junctions for Terahertz Switches and Detectors.

Hnid,

Yassin,

Arbouch

et al. 2023

Preprint

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Molecular electronics targets tiny devices exploiting the electronic properties of the molecular orbitals, which can be tailored and controlled by the chemical structure/conformation of the molecules. Many functional devices have been experimentally demonstrated; however, these devices were operated in the low frequency domain (mainly, dc to MHz). This represents a serious limitation for electronic applications, albeit molecular devices working in the THz regime were theoretically predicted. Here, we experimentally demonstrate molecular THz switches at room temperature. The devices consist of self-assembled monolayers of molecules bearing two conjugated moieties coupled through a non-conjugated linker. These devices exhibit clear negative differential conductance behaviors (peaks in the current-voltage curves), as confirmed by ab initio simulations, which were reversibly suppressed under illumination with a 30 THz wave. We analyze how the THz switching behavior depends on the THz wave properties (power, frequency), and we benchmark that these molecular devices would outperform actual THz detectors.

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Section: Loading Force and C-afm Tip Contact Areamentioning

confidence: 99%

“…ultrafast electron transfer), from simple H2 to pentacene, nickelocene, for example. [11][12][13] These works have demonstrated their benefit to overcome the diffraction limits allowing to reach simultaneously high spatial and ultrafast temporal resolution affording new insights for nanoscale devices (see a review in Ref. 9).…”

mentioning

confidence: 99%

Molecular Junctions for Terahertz Switches and Detectors.

Hnid,

Yassin,

Arbouch

et al. 2023

Preprint

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“…At the nanoscale, the interactions between molecular-based devices and microwave-to-terahertz electromagnetic waves are a fascinating and relatively recent field of research since the beginning of molecular-scale electronics 50 years ago. , As examples, the polarizability of alkyl chains and π-conjugated oligomers in self-assembled monolayers (SAMs) were first measured by combining a dc bias and a microwave signal (around a few to a few tens of GHz) in a rf-STM (radio frequency scanning tunneling microscope) experiment. , The spin resonance of single molecules deposited on surfaces can be probed and manipulated (in UHV and at low temperatures) with a rf-STM, combined with a magnetic field (ESR-STM: electron spin resonance STM). − THz waves coupled with a STM (lightwave-driven THz-STM) , was proven to be a powerful approach to study ultrafast dynamics of single molecules (e.g., ultrafast electron transfer), from simple H 2 , pentacene to nickelocene, for example. − These works have demonstrated their benefit to overcome the diffraction limits allowing to reach simultaneously high spatial and ultrafast temporal resolution, affording new insights for nanoscale devices (see a review in ref ). However, to the best of our knowledge, none of these works concern the direct measurement of the dynamic conductance of molecular devices in this microwave frequency regime and at room temperature.…”

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confidence: 99%

Molecular Junctions for Terahertz Switches and Detectors

Hnid,

Yassin,

Arbouch

et al. 2024

Nano Lett.

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Molecular electronics targets tiny devices exploiting the electronic properties of the molecular orbitals, which can be tailored and controlled by the chemical structure and configuration of the molecules. Many functional devices have been experimentally demonstrated; however, these devices were operated in the low-frequency domain (mainly dc to MHz). This represents a serious limitation for electronic applications, although molecular devices working in the THz regime have been theoretically predicted. Here, we experimentally demonstrate molecular THz switches at room temperature. The devices consist of self-assembled monolayers of molecules bearing two conjugated moieties coupled through a nonconjugated linker. These devices exhibit clear negative differential conductance behaviors (peaks in the current−voltage curves), as confirmed by ab initio simulations, which were reversibly suppressed under illumination with a 30 THz wave. We analyze how the THz switching behavior depends on the THz wave properties (power and frequency), and we benchmark that these molecular devices would outperform actual THz detectors.

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