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Clearing a path for light through non-Hermitian media
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DOI：10.1515/nanoph-2024-0140.png)
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Abstract
En 中文
The performance of all active photonic devices today is greatly limited by loss. Here, we show that one can engineer a low loss path in a metal-clad lossy multi-mode waveguide while simultaneously achieving high-performance active photonic devices. We leverage non-Hermitian systems operating beyond the exceptional point to enable the redistribution of losses in a multi-mode photonic waveguide. Consequently, our multi-mode waveguide offers low propagation losses for fundamental mode while other higher order modes experience prohibitively high losses. Furthermore, we show an application of this non-Hermitian waveguide platform in designing power-efficient thermo-optic phase shifters with significantly faster response times than conventional silicon-based thermo-optic phase shifters. Our device achieves a propagation loss of less than 0.02 dB mu m-1 for our non-Hermitian waveguide-based phase shifters with high performance efficiency of P pi & sdot; tau = 19.1 mW mu s. In addition, our phase shifters have significantly faster response time (rise/fall time), tau approximate to 1.4 mu s, compared to traditional silicon based thermo-optic phase shifters.
Keywords:
non-Hermitian
lossy media
metal clad waveguides
thermo-optic
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