New hybrids combined metalloviologens with Ag/Cu iodides exhibit reversible thermochromisms, photocurrent responses, whose mechanisms are disclosed.

Electrically bistable devices play an important role in the next generation of information materials. Plasmonic noble metal nanoparticles (Au and Ag NPs) with diameters <6 nm were embedded into 3-D Cd-based metal–organic framework (MOF) matrixes via the photoreduction method to generate Au (Ag) NPs@MOF composites. Electrical bistability measurements on the sandwiched ITO/NPs@MOF/silver devices indicate that two switchable conductivity states with nonvolatile memory behaviors can be observed. The ITO/Au NP@2/Ag device with neutral matrix possesses the highest ON/OFF current ratio of 104, which can be attributed to its higher electron tunneling efficiency because of the better dispersity of Au NPs in the MOF matrix. A mechanism regarding the electric-field-induced charge-transfer process assisted by conformational change in the active layer was proposed.

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We present the time-domain analysis of the extraordinary optical transmission of the slits milled on the thin metallic film. We employ the finite-difference time-domain method to study the variations of the transmission energies with the sampling time received by several monitors that are placed on the specified positions in the structure. It is found that the physical origin of the related phenomenon may be contributed by a combining effect of single-slit effect and interslits effect. The single-slit effect is brought by the excitation of surfaceplasmon polaritons from the isolated slit and the interslits effect is caused by phase interference of the transmitted waves from two slits. When the transmissivity of an isolated slit is adjusted to a maximum, total transmissivity of the grating is never governed by phase interference and can be qualified to the contribution from a single slit alone.The extraordinary optical transmission ͑EOT͒ of light through a thin metallic film perforated with periodic arrays of subwavelength holes or slits has received an ever increasing interest. 1-18 So far, for the EOT in slit structures, there are three influential mechanisms on its physical origin that appeared in the literatures. The first mechanism is the excitation of surface-plasmon polaritons ͑SPPs͒ at metal/ dielectric interface. [3][4][5][9][10][11] The second explanation is based on dynamical diffraction theory. 12,13 The third mechanism is the transmission resonance of Fabry-Perot resonator formed by the slit with two ends open to free space. 4,14-16 In this theory, the exact origin of EOT is still debatable; for instance, Cao and Lalanne 14 have reported that the SPPs may play a negative role, thus leading to the suppression of the transmission. Therefore, the mechanisms on the EOT still are now under debate and discussion. 17 Recently, Schouten et al. 9 presented an experimental and theoretical study of EOT in a structure of two subwavelength width slits drilled on a thin metal screen. They observed oscillatory variation of transmission with the wavelength of the incident light beam. They suggested that the physical origin could be attributed to an interference effect, arising from the combination of the excitation of SPPs with their propagation along the surface from one slit to the other. This oscillation behavior was also observed in an experiment. 18 Inspired by the works above, in this Rapid Communication, we present a time-domain analysis on the mechanism of plasmon-assisted Young's two-slit transmission. We employ the finite-difference time-domain ͑FDTD͒ algorithm 19 to study the variations of the energies with sampling time received by several monitors placed on the specified positions in structure. Our simulations clearly demonstrate that the involved physical origin is the combining effect of the excitation of SPPs from an isolated slit ͑referred as single-slit effect͒ and from an interference between the surface waves transmitted from two slits ͑referred as interslit effects͒.We first prefer to revisit the...

Two lead-carboxylate/polyiodide hybrids constructed from halogen bonding and asymmetric viologen have been synthesized, which exhibit efficient photocatalytic degeneration performances.

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Six new squarate-based complexes with 3-D networks, 2-D layers and 0-D clusters have been prepared. 5 and 6 feature the first examples of incorporating squarate with viologens in one lattice, which exhibit not only photocurrent responses but also reversible thermochromisms.

The continuous photon Hall effect excited in a surface plasmon polariton system is proposed and realized theoretically, in which the parallel incident light illuminates the small ball nearing the surface. The scattering direction can be continually modulated in the large range of almost 180 degree by the elliptical polarization state of the incident light. The physical reason is displayed intuitively by the component waves interference principle.