We propose a new type of amplitude modulator for integrated optics based on phase-controllable coherent perfect loss (CPL) from a resonant cavity. Temporal coupled-mode theory is employed to derive a simple set of equations that describe the device operation, and finite-difference time-domain simulations are used to verify these equations. Two examples of CPL modulators are described with this formalism: a ring resonator and a 1D photonic crystal cavity. We show that internal resonator loss, and thus critical coupling, are not strict requirements for CPL operation. These devices are simple to design and can act as compact switches and modulators for integrated optics.
© 2013 Optical Society of America
Original Manuscript: May 14, 2013
Revised Manuscript: July 1, 2013
Manuscript Accepted: July 16, 2013
Published: August 7, 2013
Richard R. Grote, Jeffrey B. Driscoll, and Richard M. Osgood, Jr., "Integrated optical modulators and switches using coherent perfect loss," Opt. Lett. 38, 3001-3004 (2013)