The Extra-Solar Planet Imager (ESPI)
  ESPI has been proposed for direct imaging and spectral analysis of giant planets orbiting solar-type stars. ESPI extends the concept suggested by Nisenson and Papaliolios (2001) for a square aperture apodized telescope that has sufficient dynamic range to directly detect exo-planets. With a 1.5 M square mirror, ESPI can deliver high dynamic range imagery as close as 0.3 arcseconds to bright sources, permitting a sensitive search for exoplanets around nearby stars and a study of their characteristics in reflected light. 
P. Nisenson, G.J. Melnick, J. Geary, M. Holman, S.G. Korzennik, R.W.   Noyes, C. Papaliolios, D.D. Sasselov, D. Fischer, D. ...