Ultrasonics Brings Haptics to Augmented and Virtual Reality
From: Electronic Design - 11/02/2016

Technology from Ultrahaptics employs a phased array of ultrasonic speakers to
deliver sound waves that reinforce each other, so that vibrations can be
induced at a fixed position away from the array. This is similar to how a
phased-array radar system works. Ultrahaptics technology operates at a
distance. The current incarnation can operate up to 2 m from a hand.

Read the entire article at:
http://electronicdesign.com/embedded/ultrasonics-brings-haptics-augmented-and-virtual-reality

Link:
http://www.ultrahaptics.com