| http://www.w3.org/ns/prov#value | - For example, either layer may include an active gain material (and may act as an optical cavity for stimulated emission), a nonlinear optical material, an electrode, a photoemitter (e.g., a quantum dot, a fluorescent material, a scintillation material, or a waveguide), a field emitter, or a particle emitter such as a photocathode.
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