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8月30日学术报告：Quantized Interaction of Free Electrons with Cavity Photons

来源： 发布时间：2019-08-29【字体：大 中 小】

报告题目： Quantized Interaction of Free Electrons with Cavity Photons 

报告人：以色列理工学院  王康鹏博士 

报告时间：2019年8月30日10:00 

报告地点：溢智厅 

摘要：Ultrafast interactions of free electrons and laser pulses have enabled powerful imaging techniques to investigate ultrafast dynamics in transmission electron microscopy. By using femtosecond (fs) laser pulses as pump and electrons as probe, one can image the electric field of light through photon-induced near-field electron microscopy (PINEM). The pump light creates an evanescent field around the sample and then the probe electrons interact with this field by absorbing/emitting multiple quanta of photons. Employing these energy-shifted electrons for imaging, the light-field around the nanostructure can be detected with fs temporal and subwavelength spatial resolution. Specifically, by also tuning the laser frequency, one can achieve laser-stimulated electron energy spectroscopy. So far, the existing literature on PINEM focuses on the interaction with metallic or lossy structures (e.g., plasmonics), whose photonic excitations have short lifetimes, limiting their energy exchange with probing electrons. 

Here, we propose and demonstrate for the first time the quantized interaction of free electrons with resonant cavities, utilizing the strong enhancement of the resonance modes for advance microscopy capabilities. We use such PINEM interaction to perform transmission nearfield optical microscopy (TNOM) of the resonance modes in a photonic crystal (PhC), with subwavelength resolution, simultaneously measuring their lifetime, and mapping their entire angular-spectral response (i.e., the photonic bandstructure). 

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