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<\/a><\/p>\nFraunhofer IPMS<\/p>\n
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Fraunhofer IPMS<\/p>\n
\u00d7<\/a><\/p>\n Researchers routinely marshal hundreds of cold atoms into individual traps using arrays of tightly focused laser beams known as optical tweezers. Thanks to an additional device called a liquid-crystal-on-silicon spatial light modulator (LCOS-SLM), any and all of the atoms can be moved back and forth in less than a millisecond. Unfortunately, LCOS-SLMs work only at infrared and visible wavelengths. Applications that take advantage of ultraviolet (UV) light\u2019s shorter wavelengths and higher energies are off limits because UV damages the liquid crystals\u2019 organic molecules. Now Johannes Zeiher of the Ludwig Maximilian University of Munich and colleagues have demonstrated an SLM that works in the UV range [1<\/a>].<\/p>\n Like an LCOS-SLM, the new UV modulator alters the phase of incident radiation and creates patches of high and low intensity via interference. Unlike an LCOS-SLM, which works by refraction, the UV modulator works by reflection. The main component is an array of 256 \u00d7 256, 16-\u00b5m-wide aluminum mirrors. Each mirror\u2019s height is controlled by an electrically activated piston. When uniform UV laser light strikes the array, the mirrors confer on the reflected light an intricate and adjustable pattern.<\/p>\n The Fraunhofer Institute for Photonic Microsystems in Germany had already developed the modulator for a range of applications. To prove that it could work with optical tweezers, Zeiher and his colleagues had to correct aberrations introduced by the mirrors, show that the pistons did not introduce excessive noise, and demonstrate that the individual beam from each mirror has a desirable flat profile. Now that the researchers have tested the device, they plan to use it in experiments relevant to quantum computing with neutral atoms and to quantum simulations of large, 2D quantum magnets.<\/p>\n \u2013Charles Day<\/p>\n Charles Day is a Senior Editor for\u00a0Physics Magazine<\/a>.<\/p>\n ReferencesM. Ammenwerth et al., \u201cDynamical spatial light modulation in the ultraviolet spectral range,\u201d Phys. Rev. Appl. 24, 034031 (2025)<\/a>.Dynamical spatial light modulation in the ultraviolet spectral range<\/a><\/p>\n Maximilian Ammenwerth, Hendrik Timme, Veronica Giardini, Renhao Tao, Flavien Gyger, Ohad Lib, Dirk Berndt, Dimitrios Kourkoulos, Tim Rom, Immanuel Bloch, and Johannes Zeiher<\/p>\n Phys. Rev. Applied 24, 034031 (2025)<\/a><\/p>\n Published September 11, 2025<\/p>\n Subject AreasAtomic and Molecular Physics<\/a>Optics<\/a>Related Articles A Bose-Einstein condensate of radioactive atoms could turn into a source of intense, coherent, and directional neutrino beams, according to a theoretical proposal. Read More \u00bb<\/a><\/p>\n A new technique allows the imaging of an atomic system in which the interatomic spacing is smaller than the optical-resolution limit. Read More \u00bb<\/a><\/p>\n<\/a>Atomic and Molecular PhysicsEnvisioning a Neutrino Laser<\/a>September 8, 2025<\/p>\n<\/a><\/a>Atomic and Molecular PhysicsMagnifying Atomic Images<\/a>September 2, 2025<\/p>\n