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Physics

Intelligent Perception Assisted Light Modulation for real-time and program-free nanofabrication and particle manipulation

Weixin Zhu, Hanyu Guo, Chen Zhang, Fang Yang, Ce Zhang, Lijing Zhong, Jianrong Qiu, Kaige Wang, Jintao Bai, Wei Zhao

Featured June 15, 2026

Original Paper

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Simply

Moving your hand now directly steers a powerful laser, thanks to a smart system that instantly understands your gestures and smooths out shaky movements, letting you draw tiny things or move cells without any coding.

In depth
The paper introduces an Intelligent Perception-Assisted Light Modulation (IPALM) technique that enables direct, program-free control of femtosecond lasers for nanofabrication and particle manipulation. It achieves this by integrating real-time hand-motion recognition with dynamic spatial light modulation, effectively translating human gestures into precise laser beam control. A key innovation is the use of a four-term exponential moving average median filter to stabilize noisy hand key point detections, ensuring smooth and accurate laser steering.

Key Takeaways

  • 1
    The IPALM system provides program-free, real-time control of femtosecond lasers for micro/nanofabrication and particle manipulation, overcoming limitations of traditional pre-programmed methods.
  • 2
    It integrates real-time hand motion recognition (using a lightweight CNN) with dynamic spatial light modulation, achieving a low latency of 42 ms for human-computer interaction.
  • 3
    A novel four-term exponential moving average median filtering technique is employed to suppress hand tremor noise, enabling high-precision laser direct writing down to 280 nm and stable multi-particle manipulation.

Conceptual Flow

HIGH LEVEL
1
Methodology: Human-Driven Laser Control

A camera watches your hand, a computer understands your finger movements, and then tells a special mirror how to shape a laser beam to do what you want, all in real-time.

Hand Movement
Understand & Smooth
Laser Beam Control
2
Results: Precise Micro-World Interaction

This new way of controlling lasers lets people draw super tiny patterns or gently move multiple tiny cells around, showing it works for making small things and helping with biology.

Human Gesture
Direct Laser Action
Tiny Structures Made
Small Particles Moved