Abstract
We propose an ultra-wideband optical diode device based on two-dimensional
square-lattice photonic crystals. For the device, the odd mode is completely
transmitted in one direction and converted to the fundamental even mode, but
completely reflected in the other direction. The operation bandwidth of the device
is preserved within a rather wide range of frequencies, which is over 6.5% of the
central frequency. A directional coupler and 90° bend are utilized as the composite
function device with mode filter and mode converter. It is possible that the
photonic crystal device can help to construct on-chip optical logical devices and
benefit greatly to the optical systems with multiple spatial modes.
© 2014 Chinese Optics Letters
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