Plane Wave Scattering from a Curved HIS: Normal Incidence

Durgun, Ahmet Cemal
Birtcher, Craig R.
An approximate analytical method is developed to characterize the reflection properties of a cylindrically curved high impedance surface (HIS). This method assumes a homogenized model for the curved HIS which can be extracted from the reflection properties of the flat HIS. In this work, only the normal incidence case is considered for TEz and TMz polarizations.


Surface Wave Effects on the Reflection Phase of Curved High Impedance Surfaces
Durgun, Ahmet Cemal; Birtcher, Craig R. (2013-01-01)
For most cases, the reflection phase diagram of a curved High Impedance Surface (HIS) is independent of the curvature. However, the surface waves generated on HISs, due to their periodic geometry, distorts their reflection characteristics within specific frequency intervals. In those intervals, the reflection phase changes as a function of radius of curvature and size of the HIS. These effects are not observed for the flat cases because of the lower radiation resistance of the surface waves.
Exciton related nonlinear optical properties of a spherical quantum dot
Aksahin, E.; Unal, V. Ustoglu; Tomak, Mehmet (2015-11-01)
The nonlinear optical properties of an exciton in a spherical quantum dot (QD) is studied analytically. The nonlinear optical coefficients are calculated within the density matrix formalism. The electronic problem is solved within the effective mass approximation. The contributions from the competing effects of the confinement, the Coulomb interaction, and the applied electric field are calculated and compared with each other. We have made no assumptions about the strength of the confinement. We concentrate...
Reflection Phase Characterization of a Circularly Symmetric High Impedance Surface
Amiri, Mikal Askarian; Balanis, Constantine A.; Durgun, Ahmet Cemal (2014-01-01)
The reflection characteristics of a circularly symmetric high impedance surface, with a circular substrate in a cartesian coordinate system, is studied and compared with that of the rectangular HIS with straight strips. The operational bandwidth of the circular and rectangular HISs are obtained and compared together.
Nonlinear optical properties of a Woods-Saxon quantum dot under an electric field
AYTEKİN, ÖZLEM; Turgut, Sadi; Unal, V. Ustoglu; Aksahin, E.; Tomak, Mehmet (Elsevier BV, 2013-12-01)
A theoretical study of the effect of the confining potential on the nonlinear optical properties of two dimensional quantum dots is performed. A three-parameter Woods-Saxon potential is used within the density matrix formalism. The control of confinement by three parameters and an applied electric field gives one quite an advantage in studying their effects on the nonlinear properties. The coefficients investigated include the optical rectification, second and third-harmonic generation and the change in the...
Excitonic effects on the nonlinear optical properties of small quantum dots
KARABULUT, İBRAHİM; Safak, H.; Tomak, Mehmet (IOP Publishing, 2008-08-07)
The excitonic effects on the nonlinear optical properties of small quantum dots with a semiparabolic confining potential are studied under the density matrix formalism. First, within the framework of the strong confinement approximation, we present the excitonic states and then calculate the excitonic effects on the nonlinear optical properties, such as second harmonic generation, third harmonic generation, nonlinear absorption coefficient and refractive index changes. We find the explicit analytical expres...
Citation Formats
A. C. Durgun and C. R. Birtcher, “Plane Wave Scattering from a Curved HIS: Normal Incidence,” 2012, Accessed: 00, 2021. [Online]. Available: