Eye-tracking modules in augmented reality devices may use multiple near-infrared illuminators and cameras that flash in an interlaced manner. Due to sequential flashing, the eyeball location captured at a particular time differs between illuminators, thereby reducing tracking accuracy. This disclosure describes techniques for simultaneously generating dual images at distinct near-infrared wavelengths. Illuminators of two near-infrared wavelengths flash simultaneously. An optical apparatus that includes a metalens, a dual-band infrared pass filter, an imaging sensor, etc., separates incoming light into its constituent wavelengths to form simultaneous images at distinct wavelengths. Dual, wavelength-separated images are obtained with little or no difference in captured pupil location, enabling accurate eye tracking. The described techniques can be utilized by makers of AR/VR/XR devices in the eye-tracking sensing subsystem of such devices.

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