SurfaceScience21 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 69: Poster Session V: Poster to Mini-Symposium: Infrared nano-optics III
O 69.3: Poster
Mittwoch, 3. März 2021, 10:30–12:30, P
Plasmonic antenna coupling to hyperbolic phonon polaritons for sensitive and fast mid-infrared photodetection with graphene — •Sebastian Castilla1, Ioannis Vangelidis2, Varun-Varma Pusapati1, Jordan Goldstein3, Tetiana Slipchenko4, Luis Martin-Moreno4, Dirk Englund3, Klaas-Jan Tielrooij5, Rainer Hillenbrand6, Elefteris Lidorikis2, and Frank Koppens1 — 1ICFO - The Institute of Photonic Sciences, Castelldefels (Barcelona), Spain — 2University of Ioannina — 3Massachusetts Institute of Technology — 4University of Zaragoza — 5Catalan Institute of Nanoscience and Nanotechnology (ICN2) — 6CIC nanoGUNE
In this work, we show the realization of a new concept room temperature ultrafast infrared photodetector that exceeds any commercial technology. It has a response time of <15 nanoseconds (setup limited), while at the same time showing excellent sensitivity: we extracted a NEP down to 82 pw/√Hz at 6 µm. Our approach consists in exploiting the efficient coupling of plasmonic antennas with hyperbolic phonon-polaritons (HPPs) in hBN for highly concentrate mid-infrared light into a graphene pn junction in order to overwhelm its low absorption and small photoactive area. The antennas plasmonic resonances spectrally overlap within the upper reststrahlen band of hBN (6-7 µm), thus launching efficiently these HPPs and guiding them with constructive interferences towards the photodetector active area. These experimental results are in excellent quantitatively agreement with a novel multiphysics model, which includes optical, thermal and electrostatic simulations.