• Existing image sensors (CMOS, CCD) have fixed spectral responses, causing performance degradation in dynamic lighting conditions; algorithmic post-processing introduces latency and energy overhead.
• A bio-inspired spectral adaptive visual device, mimicking Pacific salmon's spectral regulation, uses a filterless, single-structure stacking approach to achieve bias-voltage-tunable spectral response.
• The device enables 'depth-tunable' response via material heterostructures, avoiding the bulk and complexity of traditional multi-channel systems, and provides hardware-level adaptive sensing.
• This structure-defined functionality paradigm opens new avenues for next-generation visual systems, particularly for edge computing and high-speed applications.