Photonic device for providing light radiation comprising an optical mode in a wave guide

A photonic device for providing light radiation comprising an optical mode in a wave guide, the device comprising:

• a wave guide extending in a plane along a main direction of propagation of the optical mode;
• an N-type semiconductor layer covering the wave guide;
• an active region comprising a stack of layers of III-V materials, the active region disposed on, and in contact with, a portion of the N-type semiconductor layer in line with a portion of the wave guide, another free portion of the N-type semiconductor layer not contacting the active region;
• a plurality of P-type semiconductor pillars on and in contact with the active region, the P-type semiconductor pillars comprising P-type semiconductor material having a first optical index, the P-type semiconductor pillars separated from each other by an encapsulation material having a second optical index, the second optical index lower than the first optical index;
• and
• at least one first metal pad in ohmic contact with the free portion of the N-type semiconductor layer, and at least one second metal pad in ohmic contact with the P-type semiconductor pillars.