Showing 3 results for Bragg Reflection
, ,
year 21, Issue 0 (3-2015)
Abstract
In this paper, we propose a microring (MR) resonator, based on Bragg reflection waveguides (BRWs) for enhanced second harmonic generation (SHG) and numerically simulate it using finite element method (FEM). Our proposed structure uses strong modal dispersion properties of BRW for phase matching in SHG process, and uses the resonance of MR to enhance nonlinear optical processes. We designed our MR resonator for three different radii. According to the results, SHG is achievable for different MR radii with the same layers only by tuning the width of the waveguide.
Dr. Mojtaba Gandomkar, Mr. Morteza Hajati,
year 23, Issue 0 (2-2017)
Abstract
In this paper, second harmonic generation (SHG) in microring (MR) resonator with Bragg reflection waveguide (BRW) is investigated numerically using finite element method. Our proposed structure uses strong modal dispersion properties of BRW for enhancement of SHG process in microrings MRs. By considering thermo-optic effect, we show that the proposed device is more sensitive to temperature in comparison with previously studied AlGaAs/AlOx waveguide, which makes it more suitable for use in thermal applications. According to the simulation results, six degrees of centigrade is sufficient for switching between active wavelengths of the structure and thermal tuning. Thermal compensation of fabrication tolerances of the structure is also investigated.
Pouriya Naziri, Mahsa Khadem Sadigh, Mohammad Sadegh Zakerhamidi, Amid Ranjkesh, Tae Hoon Yoon,
year 26, Issue 0 (2-2020)
Abstract
In this paper, we propose cholesteric and polymer-stabilized cholesteric liquid crystals (LCs) samples which give different responses in the presence of external electric field for smart windows application. the cholesteric LC sample can easily switch between cholesteric and isotropic phases by applying a voltage and, the polymer-stabilized cholesteric LC sample due to the stability of the structure in the polymer can remain in the cholesteric phase for much larger voltages.
