Merge pull request #400 from SUSTech-CRA/poster-update-2026-09-09T14-30-08

# 《大湾区物理讲堂 第15期》Roger Proksch Adjunct Professor：低于噪声的4000飞米：利用干涉原子力显微镜揭示隐藏结构和动力学

> 以下内容根据公开信息整理，并经大模型处理生成，可能存在疏漏或误差，请以实际信息为准。

* 题目: 低于噪声的4000飞米：利用干涉原子力显微镜揭示隐藏结构和动力学

* 主讲人：Roger Proksch Adjunct Professor @ Group Chief Technical Officer, Oxford Instruments plc; Adjunct Professor, University of Tennessee, Knoxville

* 时间：2026年9月11日 10:00

* 地点：Room P1078, College of Science

## 主讲人简介

Roger Proksch, PhD – global AFM leader, CTO of Oxford Instruments, co-founder of Asylum Research, and adjunct professor at UT Knoxville. He holds a Ph.D. from Minnesota, worked at Digital Instruments, and co-founded Asylum in 1999, developing Cypher, Vero (R&D 100 winner 2024), and Jupiter. After Oxford’s 2012 acquisition, he led integration and growth. Author of 100+ papers (h-index 52), 39 US patents, >$250M revenue. Former APS chair, NASA Icy Worlds member, PFM co-founder. A visionary bridging academia and industry.

## 讲座简介

Most AFM measurements are limited by detector noise and bandwidth, not cantilever motion. Conventional optical beam deflection suffers from relatively high displacement-noise levels, often requiring filtering or resonant amplification that can obscure dynamics or perturb sensitive materials. In contrast, quadrature phase differential interferometry (QPDI) achieves a noise floor well below the Brownian motion of many AFM cantilevers, enabling previously inaccessible measurements. First, improved noise performance uncovers hidden dynamics in ambient force-distance curves, and enables real-time contact resonance stiffness and dissipation mapping without extra actuation.Second, for Piezoresponse force microscopy (PFM), conventional optical beam-deflection PFM requires high AC drive voltage to overcome noise, which introduces adverse effects, especially for emerging low-voltage weak-response materials. We propose interferometrically detected resonance-enhanced dual AC resonance tracking (iDART), which combines QPDI's femtometer-scale sensitivity with contact-resonance amplification and dual-frequency tracking. This method achieves ≥10× signal-to-noise improvement over leading PFM modalities, enabling imaging and switching spectroscopy at greatly reduced excitation levels.

## 海报链接

![](https://gtimg.liziwl.cn/post-img/2026-09-11T10-00-00_Roger_Proksch.jpg)

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- 10:00 - [《大湾区物理讲堂 第15期》Roger Proksch Adjunct Professor：低于噪声的4000飞米：利用干涉原子力显微镜揭示隐藏结构和动力学](2026-09-11T10-00-00_Roger_Proksch.md)

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## 2026-09-11 周五

- 10:00 - [《大湾区物理讲堂 第15期》Roger Proksch Adjunct Professor：低于噪声的4000飞米：利用干涉原子力显微镜揭示隐藏结构和动力学](2026-09-11T10-00-00_Roger_Proksch.md)

## 2026-09-10 周四

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