Pedestal High-Contrast Gratings for Biosensing.

High-contrast gratings (HCG) are an excellent candidate for label-free detection of various kinds of biomarkers because they exhibit sharp and sensitive optical resonances. In this work, we experimentally show the performance of pedestal HCG (PHCG), which is significantly enhanced in comparison with that of conventional HCG. PCHGs were found to provide a 11.

Ultrafast Excited-State Dynamics of CuBr Complex Studied with Sub-20 fs Resolution.

Ultrafast excited-state dynamics of CuBr complex was studied in acetonitrile and dichloromethane solutions using femtosecond transient absorption spectroscopy with 18 fs temporal resolution and quantum-chemical DFT calculations. Upon 640 nm excitation, the CuBr complex is promoted to the ligand-to-metal charge transfer (LMCT) state, which then shortly undergoes internal conversion into the vibrationally hot ligand field (LF) excited state with time constants of 30 and 40 fs in acetonitrile and dichloromethane, respectively. The LF state nonradiatively relaxes into the ground state in 2.

Ultrafast Photochemistry of the [Cr(NCS)] Complex in Dimethyl Sulfoxide and Dimethylformamide upon Excitation into Ligand-Field Electronic State.

The ultrafast photochemistry of the [Cr(NCS)] complex upon excitation to the T ligand-field (LF) state was studied in dimethyl sulfoxide (DMSO) and ,-dimethylformamide (DMF) in a wide temporal range (100 fs to 9 ms) by a combination of femtosecond and nanosecond transient absorption spectroscopy techniques and supported by quantum-chemical DFT/TD-DFT calculations. The initially excited T state undergoes intersystem crossing to the vibrationally hot E state with time constants of 1.1 ± 0.

Ion-beam-assisted spatial modulation of inhomogeneous broadening of a quantum well resonance: excitonic diffraction grating.

We propose a method of spatial modulation of inhomogeneous broadening of a quantum-well excitonic resonance based on local generation of defects produced by a focused ion beam. The method is applied to fabrication of excitonic diffraction grating in a single quantum-well InGaAs/GaAs structure by irradiating the sample with a beam of 35-keV He ions of exposure doses <10  cm. The spectrum of resonant diffraction on such a structure is narrower than that of reflectivity and decreases much faster with increasing temperature.

[The method for the qualitative assessment of certain characteristics of the bullet trajectory in case of the extremity gunshot wounds].

A method for the qualitative assessment of certain characteristics of the bullet trajectory in the case of a gunshot wound to an extremity is proposed to be used for the mathematical simulation of the mechanism of formation of such injuries.