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Few-mode metal-free perovskite optical fiber with second-order optical nonlinearity

Lookup NU author(s): Dr Leo TsuiORCiD, Dr Dumitru Sirbu, Dr Nathan Hill, Dr Pablo Docampo, Professor Noel HealyORCiD

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This work is licensed under a Creative Commons Attribution 4.0 International License (CC BY 4.0).

Abstract

Semiconductor core optical fibers are highly desirable for fiber-based photonic and optoelectronic applications as they can combine strong optical nonlinearities, tight light confinement, wide transmission bands, and electronic functionality within a single platform. Perovskites have emerged as particularly exciting materials for semiconductor photonics as they have strong optical nonlinearities and tunable optoelectronic bandgaps. However, lead-based perovskites contain toxic elements and are, therefore, not environmentally friendly. Furthermore, in fiber form, their core-size is prohibitively large, making them unsuitable for nonlinear optics and applications that require single-mode guidance, such as telecommunications. Here, we report a metal-free perovskite core optical fiber where lead has been substituted for an ammonium cation in the perovskite structure. The core material has a wide bandgap greater than 5 eV, a high laser damage threshold, and a core diameter that can be produced as small as 5 µm. At this core size, the fiber supports just six modes, and the fundamental mode can readily be excited and isolated. Moreover, the metal-free perovskite has a second-order susceptibility that is absent in the archetypal lead-based perovskites and many other semiconductor core materials, such as silicon and germanium. The second-order susceptibility is important for many nonlinear optics applications, such as second-harmonic generation and quantum optics.

Publication metadata

Author(s): Tsui HCL, Sirbu D, Alsaif N, Hill N, Tizzard G, Docampo P, Healy N

Publication type: Article

Publication status: Published

Journal: APL Photonics

Year: 2024

Volume: 9

Issue: 3

Online publication date: 07/03/2024

Acceptance date: 19/02/2024

Date deposited: 08/03/2024

ISSN (electronic): 2378-0967

Publisher: AIP Publishing

URL: https://doi.org/10.1063/5.0186789

DOI: 10.1063/5.0186789

Data Access Statement: The data that support the findings of this study are available from the corresponding author upon reasonable request.

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