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Abstract
In this work, we reported the design and fabrication of a compact and scalable metamaterial longpass filter with an ultrasmall footprint of ${5.1}\;\unicode{x00B5}{\rm m} \times 5.1\;\unicode{x00B5}{\rm m}$. In the stopband, light transmission can be blocked and reflected with ${\sim}{25}\;{\rm dB}$ attenuation. In the passband, light can pass through with a low insertion loss around ${-}{0.28}\;{\rm dB}$. The transition band can be redshifted or blueshifted by scaling up or down the filter block; i.e., scaling down 1% can produce a transition band blueshift of 11.4 nm. The power roll-off can be enhanced by cascading multiple filter blocks, i.e., 1.34 dB/nm by cascading three filters. These results demonstrate the great potential of the metamaterial-based waveguide devices for scalable photonic filtering applications.
© 2020 Optical Society of America
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