Optical sensing apparatus

An optical sensing apparatus, comprising:

• a substrate;
• a light-receiving device disposed on and electrically connected to the substrate;
• a light-emitting device disposed on and electrically connected to the substrate;
• an encapsulating structure disposed on the substrate, covering the light-emitting device and the light-receiving device, the encapsulating structure comprising a top surface, a first side surface, a lower surface, wherein the first side surface and the lower surface are collectively formed a recess;
• a covering cap composed of resin and disposed on the encapsulating structure, comprising a first opening, a top portion, a protruding portion, and an extending portion;
• and
• an adhesive layer arranged between the encapsulating structure and the covering cap to adhere the encapsulating structure and the covering cap,
• wherein the protruding portion extends from the top portion towards the substrate, and contacts to the top surface of the encapsulating structure, such that the protruding portion physically separates the first opening from the adhesive layer,
• wherein the extending portion extends from the top portion towards the substrate, and is arranged in the recess, and
• wherein the covering cap does not extend beyond the encapsulating structure in a top view.