报告题目：On-chip THz photonics with semiconductor frequency combs

报 告 人：Giacomo Scalari 教授

报告时间：2026年8月17日 上午10:00

报告地点：中国科学院上海微系统所  8号楼804会议室

摘要：

On‑chip coherent THz generation and control enables compact, broadband sources and devices for telecom and spectroscopy. In this talk, I will begin with coherent THz generation (1–5 THz) and on‑chip manipulation, using QCLs and planarized waveguides to achieve broadband combs in AM and FM regimes. Next, I will present a new active FM mode‑locking mechanism—the quantum walk comb—in mid‑IR QCLs, and extend to unpublished results on THz ring resonators and VECSELs. Then, I will describe generating coherent pulse trains with arbitrary repetition rates from a monolithic device, where active mode‑locking allows large detuning between modulation and natural frequencies, supported by experiments and a semiclassical model with excellent agreement. Finally, I will highlight an active on‑chip three‑channel WDM (2.6–3.2 THz), using inverse design and a frequency‑comb laser to select, amplify, and route coherent radiation, demonstrating how quantum‑engineered devices expand on‑chip THz photonics.

报告人简介：

Giacomo Scalari is Adjunct Professor at ETH since 2020. He got his diploma in Physics at the Università di Pisa in 1999. After a period at Scuola Superiore S. Anna, Pisa, he completed his PhD in December 2005 with a thesis on magneto-spectroscopy and development of THz quantum cascade lasers. He moved  to ETH in 2007 and in 2011 he became permanent senior scientist in the group of Prof. J. Faist.  His research interests are in the field of THz ultra-strong ligh-matter coupling, THz quantum cascade lasers frequency combs, THz superconducting metamaterials and cavitronics. He published more than 150 papers in international journals and gave more than 115 Invited talks and seminars.  He was awarded the Swiss Physical Society national prize in 2006 for Applied Physics and an ERC Consolidator grant on THz quantum cascade lasers frequency combs in 2016.