Abstract　 　　  

　Herschel extragalactic wide surveys which have observed about 1000 deg2, have  discovered hundreds of thousands of high-z dusty submillimeter galaxies, and hundreds of high-z submillimeter strongly lensed galaxies. Gravitational magnification there allows a gain by an order of magnitude in sensitivity in studying submillimeter galaxies at high redshift (z~1-5). I will first summarize the main results of these submm surveys, and the strategy for identifying, characterizing and following up these sources. I will mainly highlight projects in progress or considered with mm/submm cameras and interferometers about strongest lenses, highest redshift sources (z ~ 4-6), and possible proto-clusters detected by Planck and Herschel.

   Alain is the former director of IAP in 1990's and has been the Research Director of CNRS (French National Center for Scientific Research) since 1990. He has a broad range of research interest, including atomic physics, millimeter/sub-mm radio astronomy, circumstellar chemistry, infrared surveys and high-z dust and molecules. His recent research has been focused on high-z supermassive infrared objects (luminous high-z QSOs, HLIRGs, SMGs, etc.) in Herschel surveys, as well as infrared stars of the inner Galactic bulge and disk in ISOGAL survey.