Extending the spectral operation of silicon power splitters through subwavelength nanotechnology
arxiv(2024)
摘要
Power splitters play a crucial role in virtually all photonic circuits,
enabling precise control of on-chip signal distribution. However,
state-of-the-art solutions typically present trade-offs in terms of loss,
bandwidth, and fabrication robustness, especially when targeting multimode
operation. Here, we present a novel multimode 3-dB power splitter based on a
symmetric Y-junction assisted by subwavelength grating metamaterials. The
inclusion of the metamaterial structure circumvents the practical limitations
of conventional Y-junction tips and realizes smooth modal transitions.
Simulations for a standard 220-nm-thick silicon-on-insulator platform predict
minimal excess loss (< 0.2 dB) for the fundamental and the first-order
transverse-electric modes over an ultra-broad 700 nm bandwidth (1300-2000 nm).
For the fundamental transverse-magnetic mode, losses are less than 0.3 dB in
the 1300-1800 nm range. Experimental measurements validate these predictions in
the 1430-1630 nm wavelength range, demonstrating losses < 0.4 dB for all three
modes, even in the presence of fabrication deviations of up to ±10 nm. We
believe that this device is suitable for the implementation of advanced
photonic systems requiring high-performance distribution of optical signals.
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