Guo Yongkang

Near-Field Optical Transfer Function for Far-Field Super-Resolution Imaging

The far-field superlens based on surface plasmon polaritons (SPP) has shown great application potential, but it is difficult and time-consuming to reconstruct the far-field image. We derive a near-field optical transfer function (NOTF) of a silver slab and analyse its validity so that accurate information of nano-scale object in the near-field can be computed rapidly. The NOTF is helpful not only for analysing the super-resolution imaging process in far-field, but also for providing a track to describe the transmission of optical information from near-field to far-field by using the optical transfer functions theory only.

Photoetching cellulose-film recording material and fabrication of double-faced micro-optical elements.

A novel, to our knowledge, polymer-type holographic and photoetching recording material-photoetching cellulose film-is reported. Its basic photochemical reaction scheme and the mechanism of image formation are discussed with respect to electron-spin resonance spectra and infrared spectra. Meanwhile, its characteristics, such as a strong real-time effect, high spatial resolution, linear surface-relief modulation capacity, and delayed development effect, are investigated experimentally. Finally, taking advantage of its double-faced photosensitivity, we fabricate integrated micro-optical elements that have both the functions of beam splitting and focusing.

Spatial Light Modulator Based on Surface Plasmon Polaritons for Chromatic Display

A spatial light modulator (SLM) based on surface plasmon polaritons (SPPs) that can generate chromatic pattern is demonstrated. The device is composed of a waveguide with a thin silver film and an active material The simulated results show that the SLM can modulate the intensity of three different wavelengths at the same time and combine a colour picture in the image surface. The SLM also owns the characteristics of high sensitivity, high contrast, fast time response etc. This means that the SLM is promising in the chromatic display.

Study on the spectrum of phase fractal structure

Abstract In this paper, the term of phase fractal structure is presented. The Cantor relief structure was designed and fabricated by photolithography. We derived its recurrence formulas for the Fourier spectrum function and pointed out that its power spectrum is composed of two parts, the spectrum for the main structure and the spectrum for the accompanying structure. The power spectrum of six concurrent generations and the experimental power spectrum are also illustrated and its characteristics are analysed.