Using patterned carbon nanotube films with optical anisotropy to tune the diffracted color from flexible substrates

Carbon Nanotube Based High Resolution Holograms

“…Furthermore, in contrast to the conventional two dimensional (2D) holograms, CNT arrays have a 3D structure that causes the optical diffraction in an anisotropic manner 20. The diffraction from nanotube arrays is expected to be dependent on the angle of incidence and the polarization of light.…”

On the reflection and diffraction of carbon nanotube array thin film

“…The diffraction phenomenon generated by grating-patterned CNT arrays was first observed by Hsieh et al [10], although without a thorough theoretical analysis. Therefore, a theoretical analysis of the diffractive efficiency for this kind of grating-patterned CNT array thin film is developed here and the theoretical prediction is compared with experimental results.…”

“…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].…”

“…By measuring reflectivity in the visible and near infrared ranges, de los Arcos et al [8] presented a non-destructive approach for characterizing CNT arrays and proposed a simple model for determining their thickness and porosity. Most of their models focused on the optical behavior of transverse electric (TE)-polarized light, while the transverse magnetic (TM)-polarized component was not discussed [10].…”

“…CNT arrays are therefore promising candidates for application in solar cells [29], radiometers [30][31][32] and photonic devices [25]. The diffraction phenomena in grating-patterned [10] and circular-patterned [33] CNT array thin film have also been experimentally investigated. Hsieh et al [10] examined the diffraction efficiency for different incident angles and detection angles, and also reported the influence of convex and concave bending of CNT array thin film on the diffraction efficiency.…”