This paper presents the proposal of a high resolution, integral field spectrograph that is currently being designed for the 4-meter aperture European Solar Telescope. This instrument is optimized for the study of the solar chromosphere and photosphere to allow the investigation of magnetic phenomena concentrated within these two layers. It will observe a bidimensional field of view of 80 arcsec2 that is reorganized, using an integral field unit, into eight long slits of 200 arcsec length by 0.05 arcsec width. A new concept of image slicer has been specifically designed for this instrument. It is a telecentric system and, because of the symmetry of its layout, it presents several advantages, which are presented in this paper. The spectrograph will have capabilities to observe different layers of the Sun at the same time due to its multi-wavelength capability that allows the observation of 5 visible and 3 near-infrared wavelength intervals from 3900 to 23000 Å{}, with a spectral resolution of about 300,000. In addition, it is designed to offer two modes of operation: spectroscopic and spectro-polarimetric. The optical quality of the instrument is diffraction limited.