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主办单位：
中国光学工程学会清华大学上海理工大学
名誉主编： 庄松林院士
国际主编： 顾敏院士
主编：
孙洪波教授仇旻教授
创刊：2020年3月
ISSN：2662-1991

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最新上线

Twist-engineered acoustic plasmon nanocavities enable deep-nanoscale terahertz molecular fingerprinting

Hongbo Zhang, Pengwei Li, Xiaoyu Yang, Wen Wan, Shu Chen, Guangyou Fang, Yiming Zhu, Songlin Zhuang

doi: 10.1186/s43074-025-00194-3

Abstract(0) PDF(0)

Abstract:
Field-enhanced terahertz spectroscopy serves as a powerful analytical tool for biochemical sensing, materials characterization, and medical diagnostics, where detection sensitivity fundamentally depends on electric field enhancement and confinement. However, the severe scale mismatch between long terahertz wavelengths (on the order of 100 \(\upmu\) m) and nanoscale analytes (typically < 10 nm) imposes critical limitations on conventional far-field techniques. Here, we present a breakthrough sensing approach utilizing twisted double-layer graphene plasmonic metasurfaces (t-DL-GPMs) with nanometric dielectric spacers. Our investigations reveal that these t-DL-GPMs support strongly confined acoustic plasmon nanocavity modes featuring extraordinary field enhancement and deep subwavelength field concentration, along with an extremely small mode volume (10⁻¹³λ₀³). Compared to single-layer and untwisted double-layer graphene configurations, the twisted architecture demonstrates dramatically improved sensing performance, with figures of merit enhanced by factors of 22 and 48, respectively. Most significantly, the platform enables clear identification of terahertz vibrational fingerprints from molecular layers as thin as 1 nm. This work not only opens novel avenues for nanoscale terahertz detection, pushing the THz sensing into unprecedented deep-nano level, but also establishes a versatile foundation for exploring extreme light-matter interactions and developing advanced terahertz photonic devices.

Mechano-electro-optical conversion dynamics in mechanoluminescence and its application in remote human–robot interaction

Haoliang Cheng, Shuangqiang Fang, Yi Li, Qiangqiang Zhu, Yixi Zhuang, Rongjun Xie, Wei Yan, Ding Zhao, Min Qiu, Le Wang

doi: 10.1186/s43074-025-00210-6

Abstract(22) PDF(0)

Abstract:
Mechanoluminescence (ML) is bringing a paradigm-shifting for next-generation light-based human–robot interaction. However, the overlooked character of ML temporal dynamic response remains a critical barrier to overcoming the limitation of mechano-optical conversion efficiency. Here, by resolving the dynamic interplay among stimuli rate, interfacial charge accumulation and ML performance of three typical materials, like ZnS:Cu²⁺, SrAl₂O₄:Eu²⁺,Dy³⁺, Y₃Al₅O₁₂:Ce³⁺, the cognition of ML has been deeply understand. Obviously, the ML performance is predominantly governed by the cross-coupling of stimuli rate and stimuli time rather than absolute stress magnitude. For the first time, the optimal stretching stimulation rate for commercial ZnS:Cu²⁺, SrAl₂O₄:Eu²⁺,Dy³⁺ and Y₃Al₅O₁₂:Ce³⁺ are respectively determined as ~ 10.3 Mpa/s, ~ 11.0 Mpa/s, ~ 31.9 Mpa/s, which is of great significance for obtaining high-performance ML behavior, and an ubiquitous ML hysteresis phenomenon is demonstrated originating from a time-consuming mechano-electro-optical conversion process even existing in trap-controlled SrAl₂O₄:Eu²⁺,Dy³⁺. Moreover, a qualitative relationship for ML brightness (MLB), stimuli rate (sr), stimuli time (st), inherent interfacial triboelectricity coefficient (iitre) and relative interfacial triboelectricity coefficient (ritre) is established as MLB = f(sr)*g(st)*p(iitre)*q(ritre) for guiding the design of ML elastomers. For instance, based on this equation, a topology-optimized Y₃Al₅O₁₂:Ce³⁺@polydimethylsiloxane (PDMS) elastomer is engineered, achieving unprecedented 693 times brighter emission, 78% lower stress threshold and 20% lighter weight, which is successfully applied in remote control (~ 450 m) of quadruped robot. Three main contributions of this work include: (i) demonstrating the influence law of temporal dynamic stimulation on ML performance. (ii) resolving long-standing mechano-optical asynchrony debates. (iii) establishing a universal guideline for designing high-performance ML platforms.

Highly sensitive self-calibrating birefringence measurement based on anisotropic laser feedback polarization effect

Shiwei Deng, Xunda Chang, Jiayu Wang, Yifan Wang, Xin Xu, Kewu Li, Yidong Tan, Guangwei Hu

doi: 10.1186/s43074-025-00208-0

Abstract(18) PDF(0)

Abstract:
Accurate measurements of dual parameters of phase retardance and retardance axis of birefringent materials are of fundamental importance to their fabrication and applications. However, current techniques typically exhibit limited versatility, suffering from high complexity, insufficient accuracy, and low efficiency. In this study, we propose and demonstrate the anisotropic laser feedback polarization effect for birefringent measurement, featuring simultaneous dual-parameter demodulation, unified polarization modulation-analysis architecture, high detection sensitivity, user-friendly operation, and versatile functionality. Importantly, such system can be self-calibrated with its own physical phenomena to reduce the installation derivation. To showcase the powerful effectiveness, we perform the static birefringence, dynamic birefringence variation, and spatial birefringence distribution, which remarkably exhibits the standard deviation of 0.0453° and 0.0939° for phase retardance and retardance axis azimuth, with the limit allowable sample transmittance around 10^–5. This work demonstrates comprehensive applicability across diverse birefringence scenarios, extending the application of anisotropic laser feedback polarization effect, while establishing a novel strategy for birefringence measurement.

Photon avalanche nanomaterials: from spark to surge

Chang Liu, Yuzheng Wang, Yixun Fan, Liangliang Liang

doi: 10.1186/s43074-025-00209-z

Abstract(15) PDF(0)

Abstract:
Photon avalanche (PA) upconversion, driven by a positive feedback loop that couples nonresonant ground-state absorption (GSA), resonant excited-state absorption (ESA), and highly efficient cross-relaxation (CR), gives rise to a threshold-triggered ultrahigh optical nonlinearity accompanied by uniquely prolonged rise-time dynamics. From spark to surge, this phenomenon can deliver tens to even hundreds of nonlinear orders at the nanoscale, redefining opportunities in imaging, sensing, and optical computing while opening a new paradigm for interrogating light–matter interactions.

引用排行

Terahertz spectroscopy in biomedical field: a review on signal-to-noise ratio improvement

Yan Peng, Chenjun Shi, Yiming Zhu, Min Gu, Songlin Zhuang

2020, 1(1). doi: 10.1186/s43074-020-00011-z

PDF(42)

Recent advances in multi-dimensional metasurfaces holographic technologies

Ruizhe Zhao, Lingling Huang, Yongtian Wang

2020, 1(1). doi: 10.1186/s43074-020-00020-y

PDF(70)

Information Metamaterials: bridging the physical world and digital world

Qian Ma, Tie Jun Cui

2020, 1(1). doi: 10.1186/s43074-020-00006-w

PDF(68)

Vacuum-ultraviolet photodetectors

Lemin Jia, Wei Zheng, Feng Huang

2020, 1(1). doi: 10.1186/s43074-020-00022-w

PDF(39)

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