Correlative AFM and Scanning Microlens Microscopy for Time-Efficient Multiscale Imaging

Area of Science:

• Materials Science
• Nanotechnology
• Optical Engineering

Background:

• Microelectronics and nanofabrication are driving integrated circuit feature sizes to the nanoscale.
• Conventional microscopy struggles to provide both rapid imaging and nanoscale resolution for circuit inspection.
• There is a critical need for improved quality and efficiency in integrated circuit inspection.

Purpose of the Study:

• To propose a nondestructive, high-throughput, multiscale correlation imaging method for integrated circuit inspection.
• To bridge the resolution gap between traditional optical imaging and atomic force microscopy (AFM).
• To enable nanoscale-level correlation between optical images and structural information for semiconductor device inspection.

Main Methods:

• Combines atomic force microscopy (AFM) with microlens-based scanning optical microscopy.
• Integrates a microlens with a focused ion beam deposited tip onto an AFM cantilever.
• Utilizes a multiscale correlation imaging approach for enhanced resolution and throughput.

Main Results:

• Achieves a 3-4× increase in optical imaging magnification.
• Improves scanning imaging throughput by approximately 8×.
• Enables rapid imaging from micrometer to nanometer resolution.

Conclusions:

• The proposed method offers a powerful tool for efficient, large-scale semiconductor device inspection.
• It provides simultaneous nanoscale correlation between optical images and structural data.
• This approach overcomes limitations of conventional microscopy for nanoscale integrated circuit analysis.