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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Acceleration of Subwavelength Polaritons by Engineering Dielectric-Metallic Substrates

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Feres, Flavio H. [1, 2] ; Mayer, Rafael A. [1, 3] ; Barcelos, Ingrid D. [1] ; Freitas, Raul O. [1] ; Maia, Francisco C. B. [1]
Total Authors: 5
[1] Brazilian Ctr Res Energy & Mat CNPEM, Brazilian Synchrotron Light Lab LNLS, BR-13083970 Campinas, SP - Brazil
[2] Sao Paulo State Univ UNESP, Phys Dept, Inst Geosci & Exact Sci, BR-13506900 Rio Claro - Brazil
[3] Univ Estadual Campinas, Phys Dept, Gleb Wataghin Phys Inst, UNICAMP, BR-13083859 Campinas, SP - Brazil
Total Affiliations: 3
Document type: Journal article
Source: ACS PHOTONICS; v. 7, n. 6, p. 1396-1402, JUN 17 2020.
Web of Science Citations: 0

By synchrotron infrared nanospectroscopy, we demonstrate modulation of momentum and group velocity of subdiffractional hyperbolic phonon-polaritons (HP2), in hexagonal boron nitride nanocrystals, by varying the Sio(2) film thickness in the hBN/SiO2/Au heterostructure. We reveal acceleration of the HP2 pulse in a hBN/(SiO2 wedge)/Au heterostructure with gradient of the SiO2 thickness. The acceleration is explained by a semiclassical modeling considering the polariton pulse as a free quantum particle with effective mass dependent on its group velocity. In quantitative agreement with simulations and semiempirical analysis, the modeling predicts an average acceleration of 1.5 x 10(18) m.s(-2) close to that of similar to 1.45 x 10(18) m.s(-2) obtained from experimental inputs. From the fundamental aspect, the polariton acceleration allows discussing the undulatory-corpuscular behavior of polariton quasi-particles. The acceleration induced by the wedge is a general effect that can provide for control of the polariton pulse dynamics, which is compelling for future polaritonic devices. (AU)

FAPESP's process: 18/05425-3 - Cavity effect of the Phonon-Polaritons in Graphene-Hexagonal boron nitride two-dimensional heterostructure
Grantee:Flávio Henrique Feres
Support Opportunities: Scholarships in Brazil - Master
FAPESP's process: 19/08818-9 - Modulation of polaritons amplitude by two-dimensional dielectric junctions in the light of synchrotron infrared nanospectroscopy
Grantee:Rafael Alves Mayer
Support Opportunities: Scholarships in Brazil - Master