Phonon Polaritonics in Broad Terahertz Frequency Range with Quantum Paraelectric SrTiO 3 .

Autor: Xu R; Department of Materials Science and NanoEngineering, Rice University, Houston, TX, 77005, USA., Lin T; Department of Materials Science and NanoEngineering, Rice University, Houston, TX, 77005, USA., Luo J; Department of Materials Science and NanoEngineering, Rice University, Houston, TX, 77005, USA.; Applied Physics Graduate Program, Rice University, Houston, TX, 77005, USA., Chen X; Department of Materials Science and NanoEngineering, Rice University, Houston, TX, 77005, USA., Blackert ER; Department of Materials Science and NanoEngineering, Rice University, Houston, TX, 77005, USA., Moon AR; Nanotechnology Research Experience for Undergraduates (Nano REU) Program, Rice University, Houston, TX, 77005, USA., JeBailey KM; Department of Materials Science and NanoEngineering, Rice University, Houston, TX, 77005, USA., Zhu H; Department of Materials Science and NanoEngineering, Rice University, Houston, TX, 77005, USA.
Jazyk: angličtina
Zdroj: Advanced materials (Deerfield Beach, Fla.) [Adv Mater] 2023 Aug; Vol. 35 (32), pp. e2302974. Date of Electronic Publication: 2023 Jul 02.
DOI: 10.1002/adma.202302974
Abstrakt: Photonics in the frequency range of 5-15 terahertz (THz) potentially open a new realm of quantum materials manipulation and biosensing. This range, sometimes called "the new terahertz gap", is traditionally difficult to access due to prevalent phonon absorption bands in solids. Low-loss phonon-polariton materials may realize sub-wavelength, on-chip photonic devices, but typically operate in mid-infrared frequencies with narrow bandwidths and are difficult to manufacture on a large scale. Here, for the first time, quantum paraelectric SrTiO 3 enables broadband surface phonon-polaritonic devices in 7-13 THz. As a proof of concept, polarization-independent field concentrators are designed and fabricated to locally enhance intense, multicycle THz pulses by a factor of 6 and increase the spectral intensity by over 90 times. The time-resolved electric field inside the concentrators is experimentally measured by THz-field-induced second harmonic generation. Illuminated by a table-top light source, the average field reaches 0.5 GV m -1 over a large volume resolvable by far-field optics. These results potentially enable scalable THz photonics with high breakdown fields made of various commercially available phonon-polariton crystals for studying driven phases in quantum materials and nonlinear molecular spectroscopy.
(© 2023 Wiley-VCH GmbH.)
Databáze: MEDLINE
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