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Mirror-induced reflection in the frequency domain.

Yaowen Hu1,2, Mengjie Yu3,4, Neil Sinclair3,5

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Researchers developed novel frequency domain mirrors using electro-optic modulation. These mirrors reflect optical energy in a synthetic frequency dimension, enabling new possibilities in photonics and optical computation.

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Area of Science:

  • Photonics and Optics
  • Quantum Optics

Background:

  • Mirrors are fundamental optical elements controlling light propagation in physical space.
  • Existing optical control is limited to spatial dimensions, necessitating new methods for frequency domain manipulation.

Purpose of the Study:

  • To propose and demonstrate frequency domain mirrors.
  • To explore their theoretical properties and experimental realization.
  • To investigate applications in synthetic dimensions.

Main Methods:

  • Theoretical analysis of propagation loss and reflectivity in the frequency domain.
  • Experimental demonstration using electro-optic modulation in thin-film lithium niobate micro-resonators.
  • Excitation of Bloch waves and observation of interference patterns.

Main Results:

  • Successful demonstration of frequency domain mirrors.
  • Observation of unique wave states formed by interference between forward and reflected waves.
  • Generation of tunable frequency mirrors and demonstration of trapped states.

Conclusions:

  • Frequency domain mirrors offer a new paradigm for controlling light.
  • This technology opens avenues for advancements in topological photonics, optical computation, and frequency comb sources.
  • Potential for realizing optical elements like cavities and lasers in the frequency domain.