A method of manufacturing a semiconductor device includes forming an active pattern and a gate electrode crossing the active pattern on a substrate, forming a first contact connected to the active pattern at a side of the gate electrode, forming a second contact connected to the gate electrode, and forming a third contact connected to the first contact at the side of the gate electrode. A method for medication management comprising associating with a pharmacy or a doctor’s office, obtaining information regarding a medication for a patient, and sending the information regarding the medication to a mobile device associated with the patient. A surface of the body layer is covered by a two-dimensional microlens array of lenslets, and the other surface of the body layer is covered by a blazed diffraction grating layer.