Details

Autor(en) / Beteiligte

• Albrechtsen, Marcus
• Vosoughi Lahijani, Babak
• Christiansen, Rasmus Ellebæk
• Nguyen, Vy Thi Hoang
• Casses, Laura Nevenka
• Hansen, Søren Engelberth
• Stenger, Nicolas
• Sigmund, Ole
• Jansen, Henri
• Mørk, Jesper
• Stobbe, Søren

Titel

Nanometer-scale photon confinement in topology-optimized dielectric cavities

Ist Teil von

• Nature communications, 2022-10, Vol.13 (1), p.6281-6281, Article 6281

Ort / Verlag

London: Nature Publishing Group

Erscheinungsjahr

2022

Quelle

Free E-Journal (出版社公開部分のみ）

Beschreibungen/Notizen

• Abstract 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 topology 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  ~ 3 × 10 −4   λ 3 , quality factor Q  ~ 1100, and footprint 4  λ 2 for telecom photons with a λ  ~ 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.