发表机构
Photonics Institute, TU Wien; Centre for Micro- and Nanostructures, TU Wien; Institute of Solid-State Electronics, TU Wien; Department of Electrical Engineering and Information Technology, TU Darmstadt（光子学研究所，维也纳工业大学; 微纳结构中心，维也纳工业大学; 固态电子学研究所，维也纳工业大学; 电气与信息技术系，达姆施塔特工业大学）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
本文提出通过电学控制耦合环形量子级联激光器的增益比来操控超模对称性，实现太赫兹频率梳的快速调谐和光谱调制，并降低色散以拓宽锁定范围。
AI 中文摘要
具有快速调谐能力的光学频率梳对于集成光谱学和传感至关重要。然而，在太赫兹波段实现这种功能面临重大挑战。本工作引入了一种新颖方法，利用太赫兹激光器中的超模对称性控制。通过电学操控耦合同心环形激光器之间的增益比，我们选择性地激发对称和反对称超模，从而在不同频率范围和操作模式下实现频率调谐和光谱调制。此外，两种超模的同时激射导致总集成色散降低，拓宽了梳齿锁定范围。在矩阵形式主义和数值模拟的支持下，本工作展示了对称性控制在增强电光调制方面的潜力，为片上光谱学和传感应用开辟了新途径。
英文摘要
Optical frequency combs with fast tunability are essential for integrated spectroscopy and sensing. However, achieving such functionality in the terahertz regime presents a significant challenge. This work introduces a novel approach that exploits supermode symmetry control in terahertz lasers. By electrically manipulating the gain ratio between coupled concentric ring lasers, we selectively excite symmetric and antisymmetric supermodes, allowing frequency tuning and spectral modulation across different frequency regimes and operation modes. Moreover, simultaneous lasing of both supermodes results in a reduced total integrated dispersion, widening the comb locking range. Supported by matrix formalism and numerical simulations, this work demonstrates the potential of symmetry control for enhanced electro-optic modulation, opening new avenues for on-chip spectroscopy and sensing applications.
