Surface plasmon effects on carbon nanotube field effect transistors

Abstract

Herein, we experimentally demonstrate surface plasmon polariton (SPP) induced changes in the conductivity of a carbon nanotube field effect transistor (CNT FET). SPP excitation is done via Kretschmann configuration while the measured CNT FET is situated on the opposite side of the metal layer away from the laser, but within reach of the launched SPPs. We observe a shift of ∼0.4 V in effective gate voltage. SPP-intermediated desorption of physisorbed oxygen from the device is discussed as a likely explanation of the observed effect. This effect is visible even at low SPP intensities and within a near-infrared range.

Strong coupling between surface plasmon polaritons and β-carotene in nanolayered system

“…In addition, carotenoids are also potential candidates for molecular wires, 34 and perturbing their conductivity by SPPs can reveal new aspects from it. 35 In contrast to other dye molecules utilized in SPP studies, carotenoids show a strong electron correlation, a rather complicated excited state structure and short excited state lifetimes, and thus low fluorescence yield. Since the transition to the first excited state S 1 (with symmetry group of 2 1 A g ) is forbidden due to the molecule symmetry, the conventional absorption and fluorescence spectroscopy observes transitions involving second excited state of carotenoids, conventionally called S 2 (1 1 B u ).…”

Ultrathin carbon layer coated MoO2 nanoparticles for high-performance near-infrared photothermal cancer therapy

“…14 Recently, LSPR has been reported in graphene and carbon nanotubes as collective excitation of 2D mass less Dirac electrons. [15][16][17] Polypyrrole nanoparticles were used as promising photothermal agents for in vivo cancer therapy. 18 A topological insulator was found to assign Dirac plasmon excitations to Dirac quasi particles of the conducting two-dimensional edge state.…”

Negative and positive photoconductivity modulated by light wavelengths in carbon nanotube film

“…In the traditional Kretschmann configuration, SPPs are easily to be launched and induce changes in the conductivity of CNTs. 23 Owing to the surface roughness of nanostructures, SPPs can be excited directly by light beams 24 because in this case phase-matching conditions can be fulfilled. Due to the higher photon energy (3.06 eV) of 405 nm laser, photoexcitation played the crucial role, resulting in the observed PPC phenomenon.…”