Surface emitting laser device and surface emitting laser apparatus having the same

A surface emitting laser device, comprising:

• a substrate;
• a first metal layer disposed on the substrate;
• a second metal layer disposed on the first metal layer;
• and
• a third metal layer disposed between the first metal layer and the second metal layer,
• wherein the first to third metal layers include different materials,
• wherein the second metal layer includes copper (Cu), and
• wherein the third metal layer prevents diffusion of copper from the second metal layer into the first metal layer,
• a first reflective layer on the third metal layer;
• a light emitting layer on the first reflective layer;
• an oxide layer on the light emitting layer;
• a second reflective layer on the oxide layer;
• and
• a second electrode on the second reflective layer,
• wherein the second electrode includes a first metal layer, a second metal layer and a third metal layer disposed between the first metal layer and the second metal layer,
• wherein the first metal layer of the second electrode includes a plurality of nanopatterns;
• and
• wherein a separation distance between the nanopatterns is greater than or equal to a diameter of the nanopattern and is less than or equal to 3 times the diameter of the nanopatterns.