Article
Chemistry, Multidisciplinary
Tarek Mohamed, Ali Farhan, Hanan Ahmed, Mohamed Ashour, Samar Mamdouh, Reinhold Schuch
Summary: This study measured the nonlinear optical properties of zinc oxide nanoparticles in distilled water using a femtosecond laser and the Z-scan technique. The results showed that both laser parameters and nanoparticle features influenced the nonlinear optical properties of the nanoparticles.
Article
Optics
Mohamed Ashour, M. Sh Abdel-Wahab, Abdullah Shehata, Wael Z. Tawfik, M. A. Azooz, Souad A. Elfeky, Tarek Mohamed
Summary: This paper experimentally investigated the linear and third-order optical nonlinearities of a pure CuO thin film deposited on a soda-lime glass substrate. The film's structure and linear optical properties were measured using XRD, surface profilometer, and UV-Vis spectrophotometer. The Z-scan technique was used to measure the film's nonlinear optical properties under different excitation wavelengths and incident laser powers. The results showed a reduction in nonlinear absorption coefficient and nonlinear refractive index with increasing excitation wavelength, and wavelength-dependent optical limiting of the CuO thin film.
JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS
(2022)
Article
Chemistry, Physical
Igor M. Goncalves, Anusri Medda, Alyson J. A. Carvalho, Ceciilia L. A. V. Campos, Soubhik Ghosh, Anderson S. L. Gomes, Amitava Patra
Summary: The nonlinear optical response of CdSe and CdSe/CdS core/shell nanoplatelets in toluene suspension was studied using Z-scan and optical Kerr gate techniques. The Z-scan analysis yielded nonlinear coefficients of n(2) = 1.4 x 10(-16) cm(2)/W and n(2) = 1.3 x 10(-16) cm(2)/W for CdSe and CdSe/CdS NPLs, respectively. The dominant behavior was fifth-order nonlinear absorption, with alpha(4) = 4.0 x 10(-2) cm/GW for CdSe NPLs and alpha(4) = 9.0 x 10(-3) cm/GW for CdSe/CdS NPLs. The results from Z-scan and optical Kerr gate were in good agreement, and the response time from OKG was less than 1 ps for all materials. NLA was observed for CdSe and CdSe/CdS NPLs but not for toluene, indicating that the presence of NPLs reduces the threshold of absorptive nonlinearity. The electronic structure of the materials was discussed to explain the results.
JOURNAL OF PHYSICAL CHEMISTRY C
(2023)
Article
Physics, Multidisciplinary
Zahra Najafi Chaleshtari, Azadeh Haghighatzadeh, Amin Attarzadeh
Summary: The linear and nonlinear optical properties of valence-band electronic states in GaAs/GaAsSb/GaAs parabolic quantum well structures were investigated theoretically. The study examined the linear and third-order nonlinear optical absorption coefficients and changes in refractive index under different external conditions. The results showed that the optical responses were influenced by one-photon resonance processes and that the resonance energy spectra shifted with changes in the laser field and quantum well parameters. Additionally, the optical characteristics were enhanced with increased laser field coupling parameters, while they decreased with decreasing electric field and increasing quantum well width. The antimony content did not affect the optical properties.
EUROPEAN PHYSICAL JOURNAL PLUS
(2023)
Article
Optics
Keyin Li, Siqi Zhu, Shibo Dai, Qi Guo Yang, Hao Yin, Zhen Li, Zhenqiang Chen
Summary: The study proposes a novel approach for controlling intersubband transitions and optical properties of coaxial cylindrical quantum wells through modulation of laser parameters and barrier thickness, demonstrating potential for ultra-wide frequency tunability.
JOURNAL OF LUMINESCENCE
(2021)
Article
Optics
Kelly C. Jorge, Anderson M. Amaral, Albert S. Reyna, Leonardo de S. Menezes, Cid B. de Araujo
Summary: Optical phenomena such as nonlinear absorption and nonlinear refraction are often determined using light transmittance techniques. However, in turbid or resonant media, scattering can significantly attenuate the laser beam, leading to overestimated absorptive losses. In this study, the scattered-light imaging method was used to discriminate between the contributions of nonlinear absorption and nonlinear scattering in a turbid medium. The results obtained from both the transmittance technique and the scattered-light imaging method complement each other, allowing for a more comprehensive characterization of turbid media.
Letter
Engineering, Electrical & Electronic
Ramezan Sahebi
Summary: The study highlights the errors in calculating physical parameters, leading to inaccuracies in the reported values.
JOURNAL OF ELECTRONIC MATERIALS
(2021)
Article
Crystallography
Dmitry Ezhov, Snezhana Turgeneva, Nazar Nikolaev, Alexander Mamrashev, Sergei Mikerin, Fedor Minakov, Andrey Simanchuk, Valery Antsygin, Valery Svetlichnyi, Valery Losev, Yury Andreev
Summary: Borate crystals with high optical damage thresholds can efficiently convert terawatt laser radiation into the terahertz range. A study on the terahertz optical properties of lithium tetraborate crystal was conducted at 295 and 77 K, showing potential for converting high-power laser sources into the THz range. Four out of eight three-wave mixing processes were found to be possible, with only one type meeting collinear phase matching conditions. Cooling the crystal to 77 K increased birefringence in the THz range, affecting the coherence length for certain types of interactions.
Article
Engineering, Electrical & Electronic
Eugenio Giraldo-Tobon, J. L. Palacio, M. R. Fulla, Walter Ospina, Guillermo L. Miranda
Summary: The optical properties of a realistic single-electron GaAs/Ga1-xAlx V-groove quantum wire are studied using self-consistent dielectric response theory and numerical calculations. The results show that the geometrical parameters have a dominant effect on the optical response, while the temperature and pressure have a minor influence. Additionally, optical activity within the Terahertz band was observed in the studied V-groove quantum wires.
MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
(2022)
Article
Physics, Multidisciplinary
Varsha, M. Kria, Vijit V. Nautiyal, K. Lakaal, D. Laroze, L. M. Perez, V Prasad, E. Feddi
Summary: We studied the influence of temperature and geometrical confinement on the behavior of spherical cavities with Yukawa potential, using effective mass approximation. By considering position-dependent mass and dielectric constant, and utilizing Finite-element method, we calculated the energy eigenvalue under the effects of temperature and geometry. The optical transition from the ground to excited state exhibited a blueshift in optical absorption coefficient, refractive index changes, and second and third harmonic generation with increasing temperature. Increasing the size of the spherical cavity resulted in a redshift in the optical resonance peaks.
Article
Optics
Haishun Liu, Xiangyi Liu, Zhenwei Zhang, Cunlin Zhang
Summary: The study found that there is a linear relationship between the selected sample entropy and absorption coefficient, refractive index at specific frequency, while the nonlinear behavior between the selected sample entropy and concentration of BSA is similar to that between absorption coefficient and concentration.
OPTICS AND LASERS IN ENGINEERING
(2021)
Article
Chemistry, Physical
Hanan Ahmed, Alaa Mahmoud, Mohamed Mobarak, Hanafy Mhmoud Abd El-salam, Tarek Mohamed
Summary: Using the Z-scan method, the nonlinear absorption coefficient of rhodamine 6G dissolved in water was studied. Water exhibited saturable absorption at high power and a transition to reverse saturable absorption was observed when R6G was added. The nonlinear absorption coefficient of the R6G solution was found to be sensitive to excitation wavelength, power, and concentration.
JOURNAL OF MOLECULAR LIQUIDS
(2021)
Article
Materials Science, Multidisciplinary
Mohammed Jaouane, Ahmed Sali, E. Kasapoglu, Fatih Ungan
Summary: In this study, we theoretically investigate the impact of external electric field, non-resonant intense laser field, and adjustable physical parameters (A, M, and eta) on the linear and nonlinear behaviors of GaAs/GaAlAs cylindrical quantum dot. The wave functions and eigenvalues of the electron are obtained using the effective mass approximation and diagonalisation technique. The expressions for linear and nonlinear optical properties are calculated using the compact density matrix method. Our results show that changing the A, M, and eta parameters can cause shifts in total optical absorption coefficients (TOACs) and relative refractive index changes (RRICs), with increasingly redshifted extrema as the radius increases. Increasing electric field or laser field intensities cause displacement of the resonant peak position towards higher energies and decrease in TOACs magnitude, as well as shrinking of RRICs extrema. The model potential used in this study is important for the development and research of nanostructures systems.
PHILOSOPHICAL MAGAZINE
(2023)
Article
Chemistry, Physical
Dipanjan Banerjee, Sree Satya Bharati Moram, Chandu Byram, Jagganath Rathod, Twinkle Jena, Gopala Krishna Podagatlapalli, Venugopal Rao Soma
Summary: The research presents the outcomes of extensive femtosecond nonlinear optical studies on TiO2 and Ag-doped TiO2 nanoparticles. It was observed that Ag-TiO2 nanoparticles exhibited a significant preference for three-photon absorption and had a higher nonlinear susceptibility compared to pure TiO2 nanoparticles under 1 kHz pulse excitation. Additionally, the synthesized nanocomposites showed a noteworthy presence of three-photon absorption in the near-IR regime, which is a rare observation in these types of nanoparticles.
APPLIED SURFACE SCIENCE
(2021)
Article
Optics
Xi Zeng, Pengfei Qi, Mengdi Li, Zhenzhou Cheng, Lie Lin, Weiwei Liu, Yan Wang, Nan Zhang
Summary: The nonlinear refractive index coefficient n(2) of the human cornea was measured with high accuracy using the spectral domain Z-scan technique, showing a decrease in value with an increase in water content in the corneal sample. This method provides better signal to noise ratio and accuracy compared to conventional methods for measuring n(2) of highly scattering biological tissues.
Article
Optics
Majid Taheri, Fereshteh Hajiesmaeilbaigi, AsmaSadat Motamedi, Yasaman Golian
Article
Engineering, Electrical & Electronic
Mohammad Barzan, Fereshteh Hajiesmaeilbaigi
OPTICAL AND QUANTUM ELECTRONICS
(2015)
Article
Optics
M. R. Rashidian Vaziri, F. Hajiesmaeilbaigi
Article
Optics
Mohammad Barzan, Fereshteh Hajiesmaeilbaigi
EUROPEAN PHYSICAL JOURNAL D
(2016)
Article
Engineering, Biomedical
Asma S. Motamedi, Hamid Mirzadeh, Fereshteh Hajiesmaeilbaigi, Shadab Bagheri-Khoulenjani, Mohammad A. Shokrgozar
JOURNAL OF BIOMEDICAL MATERIALS RESEARCH PART A
(2017)
Article
Physics, Fluids & Plasmas
H. Vosoughian, G. Sarri, M. Borghesi, F. Hajiesmaeilbaigi, H. Afarideh
PHYSICS OF PLASMAS
(2017)
Article
Engineering, Electrical & Electronic
Reza Goodarzi, Fereshteh Hajiesmaeilbaigi
OPTICAL AND QUANTUM ELECTRONICS
(2018)
Article
Optics
M. Barzan, F. Hajiesmaeilbaigi
Article
Optics
D. Razzaghi, F. Hajiesmaeilbaigi, M. Alavinejad
Article
Engineering, Electrical & Electronic
B. Farmanfarmaei, M. R. RashidianVaziri, F. Hajiesmaeilbaigi
QUANTUM ELECTRONICS
(2014)
Article
Optics
M. R. RashidianVaziri, F. Hajiesmaeilbaigi, M. H. Maleki
Article
Optics
M. R. Rashidian Vaziri, F. Hajiesmaeilbaigi, M. H. Maleki
Article
Optics
D. Razzaghi, F. Hajiesmaeilbaigi, M. Ruzbehani
Article
Materials Science, Multidisciplinary
H. Razzaghi, F. Hajiesmaeilbaigi, A. A. Sabouri-Dodaran, J. Hasani-Barbaran, M. Mahdizadeh, D. Razzaghi, M. R. A. Moghaddam
OPTOELECTRONICS AND ADVANCED MATERIALS-RAPID COMMUNICATIONS
(2013)