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Researchers developed current-addressed holography in multimode vertical-cavity surface-emitting lasers (VCSELs). This technique uses orbital angular momentum (OAM) modes for faster, more compact 3D displays and holographic systems.

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Area of Science:

  • Optoelectronics
  • Photonics
  • Laser Engineering

Background:

  • High-order spatial modes in vertical-cavity surface-emitting lasers (VCSELs) are typically suppressed to maintain beam quality.
  • These modes, however, possess potential as independent information carriers.

Purpose of the Study:

  • To develop a method for utilizing high-order spatial modes in VCSELs for enhanced information capacity.
  • To enable dynamic reconfigurability in holographic systems through current-addressed mode multiplexing.

Main Methods:

  • Current-addressed modes multiplexing holography was developed for multimode VCSELs.
  • Monolithic integration of laser-nanoprinted multiplexed holograms with VCSEL chips was achieved.
  • Orbital angular momentum (OAM) components were controlled via injection current.

Main Results:

  • Demonstrated enhanced information channel capacity through injection current-dependent dominant OAM components.
  • Achieved dynamic 3D display using a 2x2 VCSEL chip array with a unit area of ~100x100 μm².
  • Reported an ultrahigh refresh rate of ~1.93 GHz, the fastest holographic switching speed for a chip-scale system to date.

Conclusions:

  • Established a novel platform for miniaturized holographic optoelectronic systems.
  • The technology enables dynamic light-field manipulation with unprecedented speed and compactness.
  • Paves the way for portable/wearable devices, high-speed interconnects, and advanced virtual/augmented reality systems with reduced latency.