Optical Interference Effects in Visible-Near Infrared Spectral Range for Arrays of Vertically Aligned Multiwalled Carbon Nanotubes

Abstract

Based on the reflectance spectra for radiation wavelength from about 380 nm to 1.8 µm, the optical interference effects in vertically aligned multiwalled carbon nanotubes films are studied. We performed the measurements for two complementary polarization states of incoming radiation (s-and p-polarization) for nanotubes arrays sparse enough for interference effects to be possible to observe. By performing the measurements for different wavelengths and incidence angles, we mapped the evolution of interference maxima/minima of reflectance signal. The results from this novel approach indicate that for the radiation polarized perpendicularly to tubes axis (s-polarization), the real part of the effective refractive index can be estimated from the classic Fabry-Pérot model. In order to describe the differences between spectra obtained for s-and p-polarizations we discuss the most important factors that affect the reflectance signal in case of investigated nanotubes arrays.

On the reflection and diffraction of carbon nanotube array thin film

“…CNT arrays in which the CNTs are grown normal and parallel to the substrates are called βaligned CNT arrays and α-aligned CNT arrays, respectively [5]. In the past two decades, the optical characteristics of these kinds of arrays have been explored in several experimental and theoretical studies [4][5][6][7][8][9][10][11][12][13]. As the dielectric function differs for lights that are polarized parallel ( s polarization) and normal ( p polarization) to the CNTs, the CNT arrays display birefringent characteristics [1,4].…”