论文标题
用于宽带相干光子学的平面化THZ量子级联激光器
Planarized THz quantum cascade lasers for broadband coherent photonics
论文作者
论文摘要
最近，对于在通信，光谱和感测的各种应用中，对综合的THZ光子学的兴趣越来越大。我们提出了一个新的集成光子平台，该平台基于积分的活跃和被动元件，该元素集成在使用低损坏聚合物平面的双金属高限量波导布局中。扩展的顶部金属化导致低波导损失和改善的分散，热和RF性能，因为它可以使THZ和微波腔的设计分离。观察到了自由运行的芯片量子级联激光梳子，横跨800 GHz，超过1.1 THz的谐波状态，并注入RF的宽带不一致的状态，跨越了近1.6 THz。通过Swifts测量，使用强大的外部RF驱动器，可以产生高达4.4 ps的模式锁定脉冲。我们证明了具有低插入损失的被动波导，从而使激光腔边界条件的调整以及在同一THZ光子芯片上的主动和被动组件的协调。
Recently, there has been a growing interest in integrated THz photonics for various applications in communications, spectroscopy and sensing. We present a new integrated photonic platform based on active and passive elements integrated in a double-metal, high confinement waveguide layout planarized with a low-loss polymer. An extended top metallization results in low waveguide losses and improved dispersion, thermal and RF properties, as it enables to decouple the design of THz and microwave cavities. Free-running on-chip quantum cascade laser combs spanning 800 GHz, harmonic states over 1.1 THz and RF-injected broadband incoherent states spanning over nearly 1.6 THz are observed. With a strong external RF drive, actively mode-locked pulses as short as 4.4 ps can be produced, as measured by SWIFTS. We demonstrate as well passive waveguides with low insertion loss, enabling the tuning of the laser cavity boundary conditions and the co-integration of active and passive components on the same THz photonic chip.
