In the field of superlens development, most research work focuses on capturing high-resolution data. However, these data will decay exponentially with increasing observation distance, and will soon be overwhelmed by low resolution data with slower decay rates. In addition, in order to obtain high-resolution data, the detector needs to be close to the object, which may cause image distortion.

The research team adopted a strategy of placing the optical detector of the virtual superlens at a distance from the object and collecting high-resolution and low resolution data through the detector. The optimization of spatial resolution is not only limited by distance, but also depends on the balance between measurement distance and signal-to-noise ratio. Researchers have effectively avoided the potential interference of detectors on high-resolution data by measuring at a distance from objects.

Professor Boris Kuhlmey stated, "By moving the detector further away, we are able to maintain the integrity of high-resolution information and filter low resolution data using post-processing techniques." After data collection is completed, the superlens operation is performed in the computer post-processing stage.

Researcher Alessandro Tuniz stated, "By selectively amplifying attenuated or disappearing light waves, we can reconstruct the true image of an object." This process achieves the detection of encoded data in "evanescent waves" without compromising image quality by reconstructing near-field images.

The traditional materials used for manufacturing superlenses are limited in their performance due to their strong light absorption. Virtual superlenses avoid this optical loss by eliminating dependence on these materials. The measurement of the "vanishing field" is carried out in the air, rather than after structured materials, and the inverse process of attenuation is completed through numerical methods.

The research team quantitatively analyzed the trade-off between noise and measurement distance, and demonstrated a virtual superlens through post-processing experiments. They reconstructed complex images with sub wavelength features, achieving up to λ/ With a resolution of 7, an object only 0.15 millimeters wide was observed through virtual post observation technology. The experimental results of the superlens are shown in Figure 1. The image of the object "THZ" (representing the frequency of terahertz light used) shows the initial optical measurement results (upper right corner), the effect after imaging with a regular lens (lower left corner), and the effect after imaging with a superlens (lower right corner). These images were captured from a distance, significantly reducing the detector's disturbance to the electromagnetic field.