Cannot use AirDrop on my Mac running Yosemite

I am trying to use AirDrop to copy some files to my iPad Air 2 but have some problems.

In my AirDrop folder, it never asked me whether I want to share it with Contact or Everyone. I have my ipad AirDrop turned on but it does not appear on my Mac's AirDrop folder.

I have Wifi and Bluetooth turned on on both devices. This is what my AirDrop window looks like:

Can someone please help on this?