Publication

Implementation of a micro electromechanical system (MEMS) phase-only light modulator (PLM) for holographic volumetric additive manufacturing

2025

Abstract

Recent developments in Volumetric Additive Manufacturing (VAM) have demonstrated the potential to print intricate objects using a more efficient light engine based on coherent light patterns encoded in Lee holograms displayed on a digital micromirror device (DMD) within a holographic configuration. Here we present an implementation of a Phase-only Spatial Light Modulator (PLM), a piston-mode design of a DMD for Holographic Volumetric Additive Manufacturing (HOLOVAM) based on reverse tomography. In this work, we characterize the PLM at 405nm and measure the diffraction efficiency. By synchronizing the laser, the rotation stage, and the PLM, we experimentally demonstrate the printing of centimeter-scale objects with diffraction-limited resolution in less than one minute. The PLM opens new avenues for Tomographic VAM with low-cost single mode UV laser diodes.

Official source

https://infoscience.epfl.ch/entities/publication/0d3658d1-5629-4b7f-90e1-7b1a470862f7

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2025

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/0d3658d1-5629-4b7f-90e1-7b1a470862f7

About this result

Related concepts (32)

Diffraction-limited system

In optics, any optical instrument or system a microscope, telescope, or camera has a principal limit to its resolution due to the physics of diffraction. An optical instrument is said to be diffraction-limited if it has reached this limit of resolution performance. Other factors may affect an optical system's performance, such as lens imperfections or aberrations, but these are caused by errors in the manufacture or calculation of a lens, whereas the diffraction limit is the maximum resolution possible for a theoretically perfect, or ideal, optical system.

Angular resolution

Angular resolution describes the ability of any such as an optical or radio telescope, a microscope, a camera, or an eye, to distinguish small details of an object, thereby making it a major determinant of . It is used in optics applied to light waves, in antenna theory applied to radio waves, and in acoustics applied to sound waves. The colloquial use of the term "resolution" sometimes causes confusion; when an optical system is said to have a high resolution or high angular resolution, it means that the perceived distance, or actual angular distance, between resolved neighboring objects is small.

Electron diffraction

Electron diffraction refers to changes in the direction of electron beams due to interactions with atoms. Close to the atoms the changes are described as Fresnel diffraction; far away they are called Fraunhofer diffraction. The resulting map of the directions of the electrons far from the sample (Fraunhofer diffraction) is called a diffraction pattern, see for instance Figure 1. These patterns are similar to x-ray and neutron diffraction patterns, and are used to study the atomic structure of gases, liquids, surfaces and bulk solids.

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Implementation of a micro electromechanical system (MEMS) phase-only light modulator (PLM) for holographic volumetric additive manufacturing

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