Barrier Eggman is the sub-boss of Flying Battery Zone Act 2 in Sonic & Knuckles, occurring before the level's main boss, the Hang Mobile.
Much like he did the last time Sonic wandered into his aerial fortress, Dr. Eggman slams on flickering forcefield barriers to lock the hedgehog into a chamber, and then opens fire with a roof-mounted laser. However, this iteration of Barrier Eggman involves no spiked platforms twirling about in the air; instead, the walls close in on Sonic every time the laser is fired, reducing the room to maneuver. Just like in Sonic 2, you are able to touch the laser to make it flash, as long as you can jump high enough. However, there's no way to destroy it using this way.
This sub-boss is eventually self-defeating; dodge the laser for long enough and Eggman misfires, blowing up something important and causing the whole of the Flying Battery to rumble in a most disturbing manner. Chase the Doctor through the airship's collapsing superstructure to make it to the Hang Mobile.
As Hyper Sonic, you can actually leap through the barrier if its timed right. The easiest way to do it is to double jump to the right when the laser shoots. If successful, you cannot defeat Robotnik right there but you are able to enter the later part of the level. The objects are glitched until the boss is defeated off-screen.