Kramers-Kronig calculations for linear and nonlinear optics of nanostructured methyl violet (CI-42535): New trend in laser power attenuation using dyes
Kramers-Kronig calculations for linear and nonlinear optics of nanostructured methyl violet (CI-42535): New trend in laser power attenuation using dyes
复制标题
DOI：
10.1016/j.physb.2018.09.040
复制
发表时间：
2019-01-01
影响因子：
2.8
通讯作者：
Soldatov, Alexander, V
中科院分区：
文献类型：
--
作者：
Assiri, Mohammed A.;Manthrammel, M. Aslam;Soldatov, Alexander, V
在本研究中，采用低成本的自旋镀膜方法，在不同转速下将不同厚度的纳米甲基紫- 10b （MV-10B）薄膜涂覆在玻璃基板上。采用x射线衍射和原子力显微镜对纳米MV-10B薄膜进行了结构分析。进行了光学测量，估计了MV-10B薄膜的直接带隙。研究表明，制备的MV-10B薄膜与传统的直接带隙半导体具有相同的性能。从光学研究来看，样品在700 nm至900 nm的红外范围和408 nm左右的可见光范围内表现出带通滤光特性。此外，样品吸收或衰减可见光谱中470和650 nm之间的波长范围，形成良好的吸收带谷，制成CUT-OFF激光滤光片。利用Kramers-Kronig关系计算折射率(n)和消光系数(k)等光学常数。根据光在半导体上的偏振光，计算了介电常数的实、虚分量。利用线性折射率色散原理估计了非线性折射率和磁化率。光学限制研究表明，MV-10B薄膜即使在低厚度下也具有很好的光学限制性能。MV-10B对He-Ne和绿色激光均表现出激光衰减行为。研究结果表明，新设计的薄膜在不同的应用中具有广阔的应用前景。
In this work, nanostructured methyl violet-10B (MV-10B) thin films of various thicknesses were coated on glass substrates by a low-cost spin coating method at different rpm. The structural analysis of nanostructured MV-10B thin films was carried out by X-ray diffraction and atomic force microscope. Optical measurements were carried out, and the direct band gap of MV-10B films was estimated. The study showed that the prepared MV-10B thin films act in the same manner as that of conventional direct bandgap semiconductors. From optical studies, the sample exhibited bandpass filter characteristics in IR range from 700 nm to 900 nm and in the visible range centered around 408 nm. Also, the sample absorbs or attenuates the range of wavelengths in the visible spectrum between 470 and 650 nm creating a good absorption band valley making a CUT-OFF laser filter. Optical constants such as refractive index (n) and extinction coefficient (k) were computed using Kramers-Kronig relations. The real and imaginary components of dielectric constant were calculated on the basis of polarization of light when it is impinging on semiconductors. Nonlinear index of refraction and susceptibilities were estimated by linear refractive index dispersion principles. Optical limiting studies showed that the MV-10B thin films are very good optical limiters even at low thickness. The MV-10B showed a laser attenuation behavior for He-Ne and green lasers. The obtained results suggest that the newly designed thin films are the promising candidate in different applications.