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<p>The growing complexity of discrete-component optical systems presents reliability challenges in extreme environments. Here, we demonstrate a monolithic hollow-core tubular cavity integrating core-anti-resonant reflection (CARR) and the transverse round trip (TRT) effects to achieve multifunctional terahertz (THz) wave manipulation. Specifically, through CARR-TRT theory modeling, we establish a parametric framework enabling customizable spatial dispersion ranges through geometric tuning of tube dimensions. And this ultra-simplified architecture simultaneously accomplishes THz guiding and frequency-dependent divergence (without conventional optical elements) and omnidirectional dispersion consistency across 360° radiation angles. When implemented in a simplified THz spectrometer, the cylindrical cavity serves as a core dispersive element, resolving characteristic spectra of three bandpass filters through angular-frequency mapping. This approach resolves the contradiction between functional complexity and environmental robustness in THz technologies, offering promising solutions for aerospace diagnostics, endoscopic spectroscopy, and harsh-environment sensing. Moreover, the CARR-TRT principle’s scalability across electromagnetic spectra opens avenues for multi-band photonic applications.</p>

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Terahertz spatial dispersive engineering via a monolithic core-antiresonant cavity

  • 期刊论文

  • 出版模式：

    开放获取

  • 发表日期：

    2026年7月20日

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  • Jiayu Zhao,
  • Linlin Yuan,
  • Yifu Tian,
  • Yangjun Mei,
  • Jiajun Yang,
  • Li Lao,
  • Yan Peng,
  • Yiming Zhu,
  • Songlin Zhuang

摘要

The growing complexity of discrete-component optical systems presents reliability challenges in extreme environments. Here, we demonstrate a monolithic hollow-core tubular cavity integrating core-anti-resonant reflection (CARR) and the transverse round trip (TRT) effects to achieve multifunctional terahertz (THz) wave manipulation. Specifically, through CARR-TRT theory modeling, we establish a parametric framework enabling customizable spatial dispersion ranges through geometric tuning of tube dimensions. And this ultra-simplified architecture simultaneously accomplishes THz guiding and frequency-dependent divergence (without conventional optical elements) and omnidirectional dispersion consistency across 360° radiation angles. When implemented in a simplified THz spectrometer, the cylindrical cavity serves as a core dispersive element, resolving characteristic spectra of three bandpass filters through angular-frequency mapping. This approach resolves the contradiction between functional complexity and environmental robustness in THz technologies, offering promising solutions for aerospace diagnostics, endoscopic spectroscopy, and harsh-environment sensing. Moreover, the CARR-TRT principle’s scalability across electromagnetic spectra opens avenues for multi-band photonic applications.