Film Interference Effects Research Articles

AlN film-based Fabry–Perot cavity resonance enhanced absorption

The enhanced Fabry–Perot (F–P) resonance caused by adding a layer of AlN film to different metal substrates (AlN/metals) was analyzed by controlling the thickness of AlN film. The obtained results using the finite-difference time-domain (FDTD) method show that the absorption capacity of visible light was changed by the film interference effect. Then, the light absorption of Au/AlN/Fe (AAF) trilayer structures exhibits that the addition of the ultra-thin Au layer to the AlN/Fe surface improves the light absorption, the color gamut, and purity. Both the transfer-matrix theory and Fresnel–Airy equation were used to compare the FDTD simulations, the calculations show that all the results are consistent. Systematic analyses revealed that AlN film as an F–P resonant cavity is a promising strategy for optical applications, and AAF is an ideal structure in the applications to optical filters, no-ink printing, and optical anti-counterfeiting.

Comparison of the capabilities of rotating-analyzer and rotating-compensator ellipsometers by measurements on a single system

We take advantage of a spectroscopic ellipsometer that can operate in both rotating-analyzer (RAE) and rotating-compensator (RCE) modes to compare directly the capabilities of the two configurations. The extra information available from the additional Fourier component of the transmitted intensity for the RCE provides considerable advantages both with respect to identifying artifacts and obtaining more accurate data. For example, our comparison revealed a previously unsuspected polarization-leakage artifact that affects RAE data to as much as several percent. Comparative measurements on Ge and ZnO show the RCE has greatly reduced sensitivity to artifacts in general, and particularly those resulting from wavelength-averaging interference effects in thin films.

X-ray interference effects in thin equiatomic Co-Pt single crystal films

Thin single crystal films of an equiatomic Co50Pt50 alloy synthesized by magnetron sputtering on a MgO single crystal substrate were studied by X-ray diffractometry. Interference oscillations with a period depending on the Co-Pt alloy film thickness were observed in the region of (001) reflection, characterizing the L10 type ordering, and in the region of small diffraction angles (2Θ<10°).

Low-temperature transport and quantum interference of ballistic particles in systems with random rough walls

We present a simple theory of transport processes and quantum interference and localization effects in films and channels with rough walls.

Photoreflectance spectra from the surface and GaAs/GaAs interfaces of doped MBE GaAs films

The authors report on photoreflectance (PR) measurements of the electric fields at the surface and GaAs/GaAs interface of doped GaAs films prepared by molecular beam epitaxy (MBE). By using He-Ne and He-Cd lasers alternately as the pump light, PR signals from the surface and interface of the films can be effectively separated because of the difference in the penetration depths of these two pump beams. Electric fields at the surface and interface were evaluated from PR spectra. Film interference effects on modulation spectroscopy have been studied. The origin of the electric field at interfaces has also been discussed.

PHOTOREFLECTANCE SPECTRA FROM SURFACES AND GaAs-GaAs INTERFACES OF DOPED MBE GaAs FILMS

This paper reports the photoreflectance(PR) measurements of electric fields at the surface and the GaAs-GaAs interface of doped MBE GaAs films. By using alternatively He-Ne laser and He-Cd laser as pumping light, PR signals from the surface and the interface of the film can be effectively seperated the different penetration depth of different light. Electric fields at the surface and the interface were deduced from PR spectra. Film interference effects on modulation spectroscopy are studied. The origin of the electric field generated at interfaces are also discussed.

Amorphous Tb-Fe-Co/Iron Garnet Composite Films On Glass Substrates

The characteristics of Bi-substituted iron garnet film and amorphous Tb-Fe-Co film, grown individually and in composite, were investigated. The Kerr rotation of the composite film is explained by the glass and film surface reflection and interference effect in garnet film. In the recorded area, the fine domain structure and the shape were improved in the composite film. The authors conclude that by varying the composition of the garnet film, it is possible to eliminate the reverse-direction domains of the garnet film visible behind the composite film recorded domains and further to improve their shape.

Economic infrared polarizer utilizing interference effects in films of polyethylene kitchen wrap

An inexpensive, easily fabricated, high quality, large aperture, pile-of-plates type, ir polarizer has been constructed having a polarization constant and insertion loss of 98% and 20%, respectively, using films of polyethylene kitchen wrap, each film being tuned for maximum performance at 10.6 microm by stretching.