4.8 Article

Observation of SQUID-Like Behavior in Fiber Laser with Intra-Cavity Epsilon-Near-Zero Effect

Journal

LASER & PHOTONICS REVIEWS
Volume 16, Issue 12, Pages -

Publisher

WILEY-V C H VERLAG GMBH
DOI: 10.1002/lpor.202200487

Keywords

epsilon-near-zero; fiber laser; indium tin oxide; mode-locking; nonlinear polarization evolution

Funding

  1. Guangdong Basic and Applied Basic Research Foundation [2021A1515012176, 2021A1515011450]
  2. Youth Science and Technology Innovation Talent of Guangdong Province [2019TQ05X227]
  3. Shenzhen Fundamental Research Program [GXWD20201231165807007-20200827130534001]
  4. Overseas Research Cooperation Fund of Tsinghua Shenzhen International Graduate School
  5. Swiss National Science Foundation [200021_188605]
  6. Israel Science Foundation [1286/17]
  7. Swiss National Science Foundation (SNF) [200021_188605] Funding Source: Swiss National Science Foundation (SNF)

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This study reports on a novel photonic system that emulates the scheme of a radio-frequency superconducting quantum interference device (RF-SQUID) using epsilon-near-zero (ENZ) nanolayers in a fiber laser cavity. Different ENZ wavelengths lead to distinct spectral outputs through the variation of cavity resonances. The findings provide insights into ultrafast ENZ photonics, enabling the design of nanophotonic on-chip devices and the study of superconducting and quantum-mechanical systems.
Establishing relations between fundamental effects in far-flung areas of physics is a subject of great interest in the current research. Realization of a novel photonic system akin to the radio-frequency superconducting quantum interference device (RF-SQUID), in a fiber laser cavity with epsilon-near-zero (ENZ) nanolayers as intra-cavity components is reported here. Emulating the RF-SQUID scheme, the photonic counterpart of the supercurrent, represented by the optical wave, circulates in the cavity, passing through effective optical potential barriers. Different ENZ wavelengths translate into distinct spectral outputs through the variation of cavity resonances, emulating the situation with a frequency-varying tank circuit in the RF-SQUID. Due to the presence of the ENZ element, the optical potential barrier is far lower for selected frequency components, granting them advantage in the gain-resource competition. The findings reported in this work provide a deeper insight into the ultrafast ENZ photonics, revealing a new path toward the design of nanophotonic on-chip devices with various operational functions, and offer a new approach to study superconducting and quantum-mechanical systems.

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