A study of wet oxidized A1(x)Ga(1-x)As for integrated optics

Bek, Alpan
Champlain, JG
Naone, R
An investigation of wet oxidized Al-x Ga1-xAs layers in integrated optical applications is reported, Refractive index and thickness shrinkage of wet oxidized AI(x)Ga(1-x)As layers are measured using spectroscopic ellipsometry, A Cauchy fit to the refractive index is found in the wavelength range between 0.3 and 1.6 mu m. The refractive index at 1.55 mu m is found to be 1.66+/-0.01 with little dispersion around 1.55 mu m. Very low loss single-mode waveguides with metal electrodes showing very low polarization dependence of loss coefficient are fabricated using wet oxidized AlxGa1-xAs layers as upper cladding, Optical polarization splitters are also designed and fabricated from the same type of waveguides taking advantage of increased birefringence, Designs utilizing wet oxidized AlxGa1-xAs are compared with conventional designs using only compound semiconductor heterostructures.


A numerical study on magneto-hydrodynamic mixed convection flow
Bozkaya, Canan (2014-01-01)
This paper, describes a study conducted to numerically investigate the two-dimensional, steady, laminar, magneto-hydrodynamic mixed convection flow and heat transfer characteristics in a lid-driven enclosure beneath an externally applied magnetic field. A solid square block is placed inside the cavity. The governing equations in the form of a stream function-vorticity-temperature formulation are solved numerically using the dual reciprocity boundary element method with constant elements. Treatment of nonlin...
The analysis of cooling curves for grey cast iron and its mechanical properties
Kalkanlı, Ali; GULDUR, H (2003-07-01)
Thermal analysis can be utilized to reveal the total graphite nucleated in cast irons by correlating the integrated areas under the cooling curves and graphite areas of a cast iron sample measured using an image analyzer. The aim of this study is to determine the effect of varying amounts of inoculants on the thermal analysis of grey cast iron by observing the changes in the shape of the cooling curves. DeltaT values, i.e. the observed undercooling before recalescence, can be correlated to the changes in th...
A study on the effects of gamma radiation on the properties of polycarbonate
Kinalır, Kerim Gökhan; Usanmaz, Ali; Kaynak, Cevdet; Department of Polymer Science and Technology (2011)
This thesis aims to investigate the effects of gamma radiation on the properties of polycarbonate, an engineering thermoplastic which has a wide range of applications. A commercial grade polycarbonate resin, after being shaped into the required specimen forms by injection molding, was irradiated with different doses up to 180 kGy. Tensile strength was found to decrease with increasing dose. The lowest values of tensile modulus, flexural modulus and flexural strength were obtained at 96 kGy, which is also th...
A comparative study of the electronic properties of aluminum nitride compounds
Mohammad, Rezek; Katırcıoğlu, Şenay (2016-01-01)
Electronic properties of aluminum nitride in wurtzite, zinc-blende, and rock-salt phases are investigated by a full potential-linearized augmented plane waves method based on density functional theory within standard local density approximation and its four improved versions. Local density approximation corrected by the generalized gradient functional of Perdew-Wang-Engel-Vosko is found to be more successful than the other generalized gradient functional approximations considered in this work for providing ...
The Analysis of Inhomogeneous Barrier Height in In/SnTe/Si/Ag Diode
Güllü, Hasan Hüseyin; YILDIZ, DİLBER ESRA (2018-12-01)
SnTe thin film layer was fabricated by magnetron sputtering technique on n-Si substrate, and the electrical properties of the In/SnTe/Si/Ag diode structure was investigated by using temperature dependent forward bias current-voltage (I-V) measurements. The main diode parameters were calculated according to the thermionic emission (TE) model and they were found in an abnormal behavior with change in temperate in which zero-bias barrier height (Phi(B0)) increases and ideality factor (n) decreases with increas...
Citation Formats
A. Bek, J. Champlain, and R. Naone, “A study of wet oxidized A1(x)Ga(1-x)As for integrated optics,” IEEE PHOTONICS TECHNOLOGY LETTERS, vol. 11, no. 4, pp. 436–438, 1999, Accessed: 00, 2021. [Online]. Available: https://hdl.handle.net/11511/92737.