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By contrast, OPS nanopolishing eliminates interfacial gaps to realize optical contact, confining plasma vertically and boosting joint strength to 16.73\u00a0MPa. Scanning electron microscope (SEM) characterizations confirm wider Si\u2013Fe\u2013O interdiffusion zones and cohesive fracture inside fused silica for polished samples, where longitudinally constrained high-density plasma provides persistent vertical action to drive sufficient bidirectional melt interpenetration at the interface. 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All rights, including for text and data mining (TDM), Artificial Intelligence (AI) training, and similar technologies, are reserved.","name":"copyright","label":"Copyright"}]}}