Ultracompact programmable inverse-designed nanophotonic devices based on digital subwavelength structures
| Autor: | Sikang Yang, Yawen Huang, Pengxiang He, Deming Liu, Minming Zhang |
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| Rok vydání: | 2023 |
| Předmět: | |
| Zdroj: | Applied Optics. 62:3926 |
| ISSN: | 2155-3165 1559-128X |
| DOI: | 10.1364/ao.488502 |
| Popis: | Inverse design is a powerful approach to achieve ultracompact nanophotonic devices. Here, we propose an ultracompact programmable near-infrared nanophotonic device platform to dynamically implement inverse-designed near-infrared devices with different functions by programming the state of the phase-change material filled in each pixel. By tuning PCM block by block, the subwavelength condition for inverse-designed ultracompact devices is satisfied with large tuning pixel size. Based on the inverse-design device platform with a footprint of 6.4µm×8µm, we design and theoretically demonstrate four power splitters with different split ratios and one mode multiplexer working in the near-infrared band. The average excess losses for the power splitters with ratios of 0:1,1:1, 2:1, and 3:1 are less than 0.82, 0.65, 0.82, and 1.03 dB over a wavelength span of 100 nm, respectively. Meanwhile, the insertion losses of the mode multiplexer are 1.4 and 2.5 dB for TE0 and TE1 mode, respectively, and the average crosstalk is less than −20 and −19dB, respectively. The five different devices could be configured online in a nonvolatile way by heating phase change materials with an off-chip laser, which may significantly enhance the flexibility of on-chip optical interconnections. |
| Databáze: | OpenAIRE |
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