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This research demonstrates that spatial coherence can be achieved at room temperature using plasmonic nanogap arrays without requiring cryogenic cooling or lasers. By leveraging strong near-field coupling to synchronize emissive dipoles under continuous-wave illumination, the study opens a scalable pathway for photonic and quantum technologies with ultralow mode volumes. The ability to maintain collective behavior in driven-dissipative systems represents a significant step toward practical applications of non-equilibrium quantum phenomena.

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Nanomaterial Arrays Achieve Spatial Coherence Without Lasers or Condensates

Quantum ZeitgeistJune 15, 20264 min read

Coherence usually demands extreme cold or precisely tuned lasers, yet this system achieves spatial synchronisation of light-emitting elements at room temperature. Previously, such collective behaviour required cryogenic conditions and complex fabrication, or resulted in highly directional light emission. Now, a two-dimensional array of nanogaps demonstrates a coordinated glow without spectral narrowing, offering a new route to explore collective photonic effects.

Arul and colleagues at University of Cambridge, in collaboration with University of St Andrews and University of California San Diego, have formed a spatially coherent state within locally-ordered nanogap arrays under continuous-wave illumination. Unlike conventional laser systems, this driven-dissipative system prioritises spatial coherence over temporal coherence, exhibiting rapid emission decay and complex spatial correlations. The formation provides a new platform for exploring synchronisation phenomena without the need for cryogenic cooling, potentially enabling scalable photonic and quantum technologies with ultralow mode…

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