Hot Paper - Cavity-assisted nonlocal metasurfaces for momentum-space broadband-operational optical vortice generation with maximum efficiency approaching 80%

Cavity-assisted nonlocal metasurfaces for momentum-space broadband-operational optical vortice generation with maximum efficiency approaching 80%

通过微秒脉冲增强中红外光声光谱技术进行Ppt级挥发性有机化合物检测腔辅助非局域超表面用于动量空间宽带操作光涡旋生成，最大效率接近80%
Pptレベルの揮発性有機化合物の検出：マイクロ秒パルス増強型中赤外光音響法による、最適効率80％に迫る運動量空間ブロードバンド光学渦生成のためのキャビティ支援非局所メタ表面
Ppt 수준의 휘발성 유기 화합물 검출을 위한 마이크로초 펄스 강화형 중적외선 광음향 공동 보조 비국소 메타표면 기반 최대 80% 효율성 달성 광학 와류 광대역 작동 생성
Detección de compuestos orgánicos volátiles a nivel de ppt mediante fotoacústica de microondas mejorada en infrarrojo medio. Cavidades asistidas por meta-superficies no locales para la generación de vórtices ópticos de banda ancha en el espacio de momento con eficiencia máxima cercana al 80%.
Détection des composés organiques volatils au niveau ppt via photoacoustique à impulsions microsecondes améliorées dans le milieu infrarouge Cavités assistées par métasurfaces non locales pour la génération de vortex optiques à large bande dans l'espace de moment avec une efficacité maximale approchant 80%
Обнаружение летучих органических соединений уровня PPT с помощью микро-секундно-импульсного усиления средне-инфракрасной фотоакустической кавитации. Нелокальные метаповерхности с кавитационной поддержкой для генерации оптических вихрей с широкополосным функционированием в пространстве импульсов с максимальной эффективностью, приближающейся к 80%

Keren Wang 王柯人 ¹, Kaili Sun 孙开礼 ², Jing Du ¹, Peijuan Dai ¹, Hao Zhou 周昊 ³, Lujun Huang 黄陆军 ⁴, Zhanghua Han 韩张华 ², Wei Wang 王卫 ¹

¹ College of Physics, Sichuan University, Chengdu 610064, China
中国成都四川大学物理学院
² Shandong Provincial Key Laboratory of Optics and Photonic Devices, Center of Light Manipulation and Applications, School of Physics and Electronics, Shandong Normal University, Jinan 250358, China
中国济南山东师范大学物理与电子科学学院光场调控及应用中心光学与光子器件技术重点实验室
³ College of Electronics and Information Engineering, Sichuan University, Chengdu 610064, China
中国成都四川大学电子信息学院
⁴ State Key Laboratory of Precision Spectroscopy, School of Physics, East China Normal University, Shanghai 200241, China
中国上海华东师范大学物理与电子科学学院精密光谱科学与技术国家重点实验室

https://doi.org/10.29026/oea.2026.250296

https://www.oejournal.org/oea/article/doi/10.29026/oea.2026.250296

Opto-Electronic Advances, 10 July 2026

Abstract

Nonlocal metasurfaces generate optical vortices via momentum-space topological singularities, eliminating the need for complex meta-atom phasing or precise beam alignment. Their utility has been constrained by narrow bandwidth and low efficiency stemming from the steep dispersion of high-Q resonances. Here, we introduce a cavity-assisted reflective nonlocal metasurface that overcomes these limits by hybridizing bound states in the continuum (BICs) with degeneracy points (DPs).

A Fabry-Pérot cavity supplies a single, addressable control for BIC-DP coupling, enabling deterministic tuning of dispersion, radiative Q, and polarization to realize quasi-flat bands with strong scattering. Simulations predict near-unity on-resonance conversion and >90% overall efficiency—3–4× higher and >15× broader than conventional designs. Experiments confirm operation from 1480 to 1600 nm with ~80% peak efficiency and 91.7% OAM purity, while suppressing edge effects and markedly reducing sensitivity to alignment, beam profile, and numerical aperture. Crucially, the device enables broadband, efficient conversion of zero-order Bessel beams into high-quality, OAM-carrying perfect vortex beams—performance not achieved by prior metasurfaces.

These results establish a practical, scalable route to broadband, high-efficiency vortex generation for high-dimensional optical communications, advanced imaging, and quantum photonics.

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