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Low‐Loss Far‐Infrared Surface Phonon Polaritons in Suspended SrTiO 3 Nanomembranes

Journal Article · · Advanced Functional Materials
 [1];  [2];  [3];  [1];  [1];  [2];  [3];  [1];  [1]
  1. Department of Materials Science and Engineering North Carolina State University Raleigh NC 27695 USA
  2. Advanced Light Source Division Lawrence Berkeley National Laboratory Berkeley CA 94720 USA
  3. Department of Quantum Matter Physics University of Geneva Geneva 1211 Switzerland
Abstract

Phonon polaritons (PhPs), excitations arising from the coupling of light with lattice vibrations, enable light confinement and local field enhancement, which is essential for various photonic and thermal applications. To date, PhPs with high confinement and low loss are mainly observed in the mid‐infrared regime and mostly in manually exfoliated flakes of van der Waals (vdW) materials. In this work, the existence of low‐loss, thickness‐tunable phonon polaritons in the far‐infrared regime within transferable freestanding SrTiO 3 membranes synthesized through a scalable approach, achieving high figures of merit is demonstrated, which are comparable to the previous record values from the vdW materials. Leveraging atomic precision in thickness control, large dimensions, and compatibility with mature oxide electronics, functional oxide membranes present a promising large‐scale 2D platform alternative to vdW materials for on‐chip polaritonic technologies in the infrared regime.

Research Organization:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
Sponsoring Organization:
US Department of Energy; USDOE; USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22), Scientific User Facilities Division (SC-22.3 )
Grant/Contract Number:
AC02-05CH11231
OSTI ID:
2565746
Alternate ID(s):
OSTI ID: 2569647
Journal Information:
Advanced Functional Materials, Journal Name: Advanced Functional Materials; ISSN 1616-301X
Publisher:
Wiley Blackwell (John Wiley & Sons)Copyright Statement
Country of Publication:
Germany
Language:
English

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