How to Raycast 2D Diagonally instead of Horizontal on a Platformer game.

Hi everybody...

I created a blink ability for my character and when I press the blink button, I send a raycast2D in front of the character, to take the new position to blink, like in: This Video.

The problem is because I want to create a raycast like this, but diagonally, like 45 degrees. How can I add a rotation to this raycast, instead of make it only horizontaly?

Thanks a lot. Ask me if I wasn't clear enough.