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Compact Lens-less Digital Holographic Microscope for MEMS Inspection and Characterization

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Hidden surface removal of computer-generated holograms for arbitrary diffraction directions.

Yusuke Sando¹, Daisuke Barada, Toyohiko Yatagai

¹Center for Optical Research & Education, Utsunomiya University, Tochigi, Japan. sando@tri-osaka.jp

|July 16, 2013

Summary

This summary is machine-generated.

A novel method efficiently calculates computer-generated holograms by treating 3D objects as point light sources. This approach effectively removes hidden surfaces for accurate holographic wavefront reconstruction.

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Digital Inline Holographic Microscopy (DIHM) of Weakly-scattering Subjects

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Published on: February 8, 2014

Area of Science:

Optics and Photonics
Computer Graphics
Computational Imaging

Background:

Computer-generated holography (CGH) is crucial for holographic displays and optical information processing.
Efficient hidden surface removal (HSR) algorithms are essential for realistic CGH.
Existing HSR methods can be computationally intensive, limiting real-time applications.

Purpose of the Study:

To propose a fast and efficient calculation method for computer-generated holograms.
To implement hidden surface removal within the hologram calculation process.
To enable accurate wavefront reconstruction for 3D objects.

Main Methods:

Representing a 3D object as a collection of point light sources.
Selecting appropriate light rays based on geometrical positions for HSR.
Converting selected light rays into the Fourier spectrum of the wavefront.
Calculating diffraction in arbitrary directions from the spherical surface Fourier spectrum.

Main Results:

A computationally efficient algorithm for CGH with HSR.
Demonstration of accurate wavefront propagation and diffraction calculations.
Successful numerical simulations of diffracted wavefronts onto arbitrary observation planes.

Conclusions:

The proposed method offers a significant speed improvement for CGH calculations.
Effective hidden surface removal is achieved by geometrical ray selection.
The method is validated through numerical simulations, confirming its practical applicability.