Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Ultra-thin silicon-on-insulator waveguide bend based on truncated Eaton
  lens implemented by varying the guiding layer thickness   Silicon-on-insulator (SOI) waveguides with different geometries have been
employed to design various integrated optical components. Reducing the bending
radius of the SOI waveguides with low bending loss is essential in minimizing
the footprint of light-wave circuits. The propagating mode is less confined in
the core of the ultra-thin SOI waveguide and penetrates to substrate and
cladding, leading to higher bending loss compared with conventional SOI
waveguide with the thicker guiding layer. While various bending mechanisms have
been utilized to reduce the bending loss of conventional SOI waveguides, the
ultra-thin SOI waveguide bends have not been studied in detail. In this paper,
we present a 60 nm-thick SOI waveguide bend based on the truncated Eaton lens
implemented by varying thickness of the guiding layer. The three-dimensional
full-wave simulations reveal that the designed waveguide bend, with a radius of
3.9 $\mu m$, reduces the bending loss from 3.3 to 0.42 dB at the wavelength of
1550 nm. Moreover, the bending loss for the wavelength range of 1260-1675 nm is
lower than 0.67 dB while the bending loss in the C-band is lower than 0.45 dB.

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The categories of this paper are: alg-geom
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The categories of this paper are: nucl-th
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The categories of this paper are: econ
6
The categories of this paper are: astro-ph
15
The categories of this paper are: nucl-ex
7
The categories of this paper are: hep-th
31
The categories of this paper are: ao-sci
37
The categories of this paper are: supr-con
25
The categories of this paper are: patt-sol
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The categories of this paper are: comp-gas
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The categories of this paper are: plasm-ph
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The categories of this paper are: eess
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The categories of this paper are: mtrl-th
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The categories of this paper are: cs
4
The categories of this paper are: cond-mat
22
The categories of this paper are: chao-dyn