Chongfan Technology
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22
2026
-
06
Optical Multistability in Photonic Crystal Microcavities
Author:
The teams of Chao Peng and Feifan Wang at Peking University achieved multi‑stability by designing a pair of spectrally close, ultra‑high‑Q resonances within a photonic crystal microcavity. By deliberately introducing structural perturbations that induce non-Hermitian coupling through shared radiation channels, the authors drove the resonances into an exceptional point characterized by nearly degenerate wavelengths and nearly identical quality factors approaching 10. This configuration enables pronounced tristability via thermo‑optic nonlinearities within a circular footprint of 20 μm in diameter, as evidenced by hysteresis loops recorded at an input power of 240 μW. Building on this concept, the authors further demonstrated an optical random-access memory (RAM) that operates through controlled switching among multiple stable states.
The research findings were published in Nature Nanotechnology on June 16, 2026, under the title “Optical multistability in a compact microcavity enabled by near-exceptional coupling.”
Figure 1: Photonic crystal microcavity with a high-Q resonance at the NEC.
Figure 2: Emergence of thermo-optic multistability at the NEC.
Figure 3: Implementation and characterization of the optical cavity
Figure 4: Experimental observation of optical multistability
Figure 5: Dynamic Operation of the Tri-state Optical Memory
Source: Optics World
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