Mode conversion and radiation loss caused by refractive-index fluctuations in an asymmetric slab waveguide

1977 ◽  
Vol 13 (4) ◽  
pp. 255-262 ◽  
Author(s):  
M. Imai ◽  
S. Miyanaga ◽  
T. Asakura
Keyword(s):  
Refractive Index ◽  
Mode Conversion ◽  
Radiation Loss ◽  
Slab Waveguide

Manipulation of thermal radiation by using photonic crystals

2021 ◽  
pp. 2150262
Author(s):  
Azka Umar ◽  
Chun Jiang
Keyword(s):  
Numerical Simulation ◽  
Refractive Index ◽  
Photonic Crystal ◽  
Photonic Crystals ◽  
Thermal Emission ◽  
Heat Energy ◽  
Radiation Loss ◽  
One Dimensional ◽  
Waveguide Core ◽  
Low Refractive Index

This paper focuses on manipulating thermal emission and radiation loss of heat energy in a heat waveguide. A One-Dimensional Photonic Crystal is used as a waveguide clad to prohibit the thermal emission from escaping. The model may reduce the radiation loss of heat energy in the waveguide core, and heat energy can be confined to propagate along the waveguide’s longitude axis. The waveguide clad comprises alternative layers of high and low refractive index materials containing sufficient electromagnetic stop bands to trap the thermal emission from escaping out of the waveguide. The numerical simulation of the model shows that the forbidden bandgap of photonic crystal structures with alternative layers of silica and silicon has width enough to make heat energy be confined within the waveguide core so that efficient heat energy transmission can be achieved along the longitude axis of the waveguide.

scholarly journals Study of a Broadband Difference Interferometer Based on Low-Cost Polymer Slab Waveguides

Nanomaterials ◽  
2019 ◽  
Vol 9 (5) ◽  
pp. 729 ◽  
Author(s):  
Kazimierz Gut
Keyword(s):  
Refractive Index ◽  
Output Signal ◽  
Propagation Constant ◽  
Low Cost ◽  
Waveguide Layer ◽  
Propagation Path ◽  
Slab Waveguide ◽  
Polymer Waveguides ◽  
Materials Used ◽  
The Impact

A model and the waveguide parameters of a broadband, polymer-based slab waveguide difference interferometer is presented in this paper. The parameters were determined based on knowledge of the dispersion in the structure materials used to fabricate the waveguide. The impact of the waveguide layer thickness, propagation path length, and change in the waveguide cover refractive index on the output signal from the system was determined. It has been shown that the direction of the maximum shifting is determined by the thickness of the waveguide layer. A relationship describing the shift in the signal extrema for a change in the waveguide cover refractive index was derived. The results show that the use of a propagation constant simplifies the description of the interferometer. Polymer waveguides, although they have a small contrast in refractive indices, allow for large shifts in the maxima of the signal. The determined shifts in the output signal extrema for polymer waveguides are comparable, and these shifts are larger for some waveguide thicknesses compared to waveguides based on Si3N4.

Temporal solitary subpicosecond pulse propagation in a dye-doped polymer slab waveguide with a negative nonlinear refractive index

1998 ◽  
Vol 72 (13) ◽  
pp. 1562-1564 ◽  
Author(s):  
Shiro Yamakawa ◽  
Keigo Hamashima ◽  
Takeshi Kinoshita ◽  
Keisuke Sasaki
Keyword(s):  
Refractive Index ◽  
Nonlinear Refractive Index ◽  
Pulse Propagation ◽  
Slab Waveguide ◽  
Doped Polymer

scholarly journals TE Magnetostatic Surface Waves in Symmetric Dielectric Negative Permittivity Material Waveguide

2009 ◽  
Vol 2009 ◽  
pp. 1-5 ◽  
Author(s):  
A. I. Ass'ad ◽  
H. S. Ashour
Keyword(s):  
Refractive Index ◽  
Surface Waves ◽  
Effective Refractive Index ◽  
Power Flow ◽  
Dielectric Film ◽  
Optical Nonlinearity ◽  
Negative Permittivity ◽  
Slab Waveguide ◽  
Left Handed ◽  
Magnetostatic Surface Wave

Nonlinear magnetostatic surface wave in a slab waveguide structure has been investigated. The design consisted of dielectric film between two thick nonlinear nonmagnetic negative permittivity material (NPM) layers. A dispersion relation for TE nonlinear Magnetostatic surface waves (NMSSWs) has been derived into the proposed structure and has been numerically investigated. Effective refractive index decreases with thickness and frequency increase have been found. Effective refractive index decrease with optical nonlinearity increase and switching to negative values of effective refractive index at a certain value of optical nonlinearity have been found. This meant that the structure behaved like a left-handed material over certain range. We found that the power flow was changing by changing the operating frequency, the dielectric film thickness, and the optical nonlinearity. Also, the effective refractive index and power flow attained constant values over certain values of dielectric constant values.

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