Abstract
The field of non‐diffracting special beams, distinguished by their non‐diffracting characteristics during propagation in free space, has experienced substantial progress over the last decade. However, the exploration of special beams has been predominantly focused on isotropic background media, with limited attention given to their behavior in anisotropic backgrounds, such as elliptical or hyperbolic media. In this study, the characteristics of non‐diffracting wave propagation in anisotropic media is investigated, specifically the hyperbolic media by means of using α‐MoO
3
, a van der Waals (vdW) crystal that supports in‐plane hyperbolic surface phonon polariton in the mid‐infrared (MIR) spectrum as the platform. Specifically, it is demonstrated that the special beams can be constructed under various isofrequency contours by the application of coordinate transformation scheme. More intriguingly, it is revealed that the special beam propagation in hyperbolic media can exhibit the distinctive feature of self‐focusing. This investigation provides new perspectives for the understanding of special beam formations and introduces new possibilities for complex beam manipulation in extreme anisotropic environments within the MIR regime.
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Publisher Copyright
Funding Info:
This research / project is supported by the ASTAR - Individual Research Grant
Grant Reference no. : M22K2c0080
This research / project is supported by the ASTAR - Individual Research Grant
Grant Reference no. : M23M2b0056
This research / project is supported by the National Research Foundation - Competitive Research Programme
Grant Reference no. : NRF-CRP22-2019-0007
This research / project is supported by the National Research Foundation - Competitive Research Programme
Grant Reference no. : NRF-CRP23-2019-0007
This research / project is supported by the National Medical Research Council - NA
Grant Reference no. : MOH-000927
Description:
This is the peer reviewed version of the following article: Zhang, Y., Wu, H., Wang, C., Yuan, G., Zou, L., Wang, Q., Wang, Q. J., & Luo, Y. (2025). Self‐Focusing Non‐Diffracting Special Beam in Hyperbolic Media. Advanced Optical Materials, 13(17). Portico. https://doi.org/10.1002/adom.202500128
, which has been published in final form at https://doi.org/10.1002/adom.202500128. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Use of Self-Archived Versions. This article may not be enhanced, enriched or otherwise transformed into a derivative work, without express permission from Wiley or by statutory rights under applicable legislation. Copyright notices must not be removed, obscured or modified. The article must be linked to Wiley’s version of record on Wiley Online Library and any embedding, framing or otherwise making available the article or pages thereof by third parties from platforms, services and websites other than Wiley Online Library must be prohibited.