Plasmonic superlens image reconstruction using intensity data and equivalence to structured light illumination for compensation of losses

Enhanced superlens imaging with loss-compensating hyperbolic near-field spatial filter

“…The active compensated spectrum closely follows the object spectrum shown by the black line and is almost noise-free. The raw image spectrum, shown by the green line and previously illustrated in figure 2(c), is significantly corrupted beyond k y 3k 0 and the passively compensated image spectrum, obtained by a simple deconvolution method [14,15] shows significant noise amplification. Lastly, figure 5(b) compares the amplitude squared of the reconstructed fields with the original object illustrating the significant enhancement of the active Π loss compensation scheme.…”

“…An auxiliary source capable of amplifying an arbitrary wavevector was also envisioned and loss compensation scheme was named the "plasmon-injection" (PI) or Π scheme. Theoretical studies later showed that the technique is similar to a linear deconvolution process [14] capable of enhancing [14][15][16][17] the resolution limits of previously studied near-field imaging systems employing negative index MMs, plasmonic lenses and hyperlenses. However, in a physical implementation of the Π scheme, a detailed understanding of the properties of the auxiliary * Corresponding author: dguney@mtu.edu source was necessary.…”

Experimental realization of the active convolved illumination imaging technique for enhanced signal-to-noise ratio

“…However, the photon losses hinder their further viability [28][29][30]. Inspiration from research in loss compensation for metamaterials and plasmonics employing 'virtual gain' [30][31][32][33] led us to propose a unique perspective on the noisy imaging problem [2,32,[34][35][36][37][38][39][40][41]. The fundamental resolution limit to superresolving lenses is not determined by the diffraction limit, but rather by a shot noise limit, i.e.…”

Controlling light with metadevices

“…However, it becomes difficult to detect the phase information, especially at visible frequencies. Adams et al showed that by illuminating with incoherent light, real-valued intensity data rather than complex field information is sufficient to reconstruct an image from a silver plasmonic superlens [214]. In addition, although the passive inverse filter mentioned in chapter 3 compensates the loss in the image, it also amplifies the noise.…”

“…Future work 5.2.1 Far-field hyperlens imaging enhanced by incoherent active convolved illumination Inspired by the plasmon injection loss compensation technique, our group members developed new research directions. Wyatt Adams and Anindya Ghoshroy are working on an active plasmon injection scheme with both coherent and incoherent light excitation[214,215,216,217].…”