| Full text | |
| Author(s): |
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
|
| Affiliation: | [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 |
| Abstract | |
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 |