Article

Efficient transmission of crossing dielectric slot waveguides

Physics Department, Northeast Forestry University, Harbin, China.
Optics Express (Impact Factor: 3.49). 02/2011; 19(5):4756-61. DOI: 10.1364/OE.19.004756
Source: PubMed

ABSTRACT

Transmission properties of two crossing dielectric slot waveguides (Si-Air-Si) are investigated using the finite difference in time domain method. Results show that the low transmission of this system mainly results from the reflection and radiation loss rather than the crosstalk. Using a simple method of filling up the crossing slots locally, the reflection, radiation losses and crosstalk are all greatly suppressed. With moderate parameters in this paper, the transmission efficient increases from 35.0% to more than 97% in a wide range of wavelength around 1.55 mm. The results and method presented in this paper may be very useful in the application of slot waveguide in micro and nano photonics.

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    • "The numerical results of Su et al. were obtained by 2-D simulations based on the finite-difference time-domain (FDTD) method, which assumes infinite core height. In our previous work, we revealed that when considering the core height of the crossing slot waveguide in [15], a finite height caused a large coupling loss between an air slot and a Si-filled region due to the mode field mismatch [16]. "
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    ABSTRACT: We investigate transmission characteristics of two types of crossing slot-waveguides using three-dimensional finite element method, a direct crossing and a crossing with filled slots. Results show that three-dimensional analysis considering the finite core-height is indispensable.
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