期刊
NATURE COMMUNICATIONS
卷 13, 期 1, 页码 -出版社
NATURE PORTFOLIO
DOI: 10.1038/s41467-022-33874-w
关键词
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资金
- Villum Foundation Young Investigator Program [13170]
- Experiment Program [00028233]
- Danish National Research Foundation [DNRF147, DNRF103]
- Independent Research Fund Denmark - Natural Sciences [0135-004038, 0135-00315]
- Innovation Fund Denmark [0175-00022 - NEXUS]
This study integrates fabrication constraints into topology optimization to achieve the strongest light-matter interaction in a photonic nanocavity. The researchers demonstrated a nanocavity with a small mode volume, high quality factor, and compact footprint, using near-field optical measurements.
Nanotechnology enables in principle a precise mapping from design to device but relied so far on human intuition and simple optimizations. In nanophotonics, a central question is how to make devices in which the light-matter interaction strength is limited only by materials and nanofabrication. Here, we integrate measured fabrication constraints into t opology optimization, aiming for the strongest possible light-matter interaction in a compact silicon membrane, demonstrating an unprecedented photonic nanocavity with a mode volume of V similar to 3 x 10(-4) lambda(3), quality factor Q similar to 1100, and footprint 4 lambda(2) for telecom photons with a lambda similar to 1550 nm wavelength. We fabricate the cavity, which confines photons inside 8 nm silicon bridges with ultra-high aspect ratios of 30 and use near-field optical measurements to perform the first experimental demonstration of photon confinement to a single hotspot well below the diffraction limit in dielectrics. Our framework intertwines topology optimization with fabrication and thereby initiates a new paradigm of high-performance additive and subtractive manufacturing.
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