  Light emitters are bound to strongly interact with light through enhanced
absorption and scattering, which imposes limitations on the design and
performance of photonic devices such as solar cells, nanoantennas, and (nano)
lasers. Overcoming these limitations forces the use of ineffective
nonreciprocity approaches or separation of radiation and scattering in the
frequency or time domain. A design that combines the properties of an efficient
emitter in one state and the property of being invisible in another state is
vital for various applications. In this work, we propose a nanolaser design
based on a semiconductor nanoparticle with gain coated by a phase transition
material (Sb2S3), switchable between lasing and cloaking (nonscattering) states
at the same operating frequency without change in pumping. The operation
characteristics of the nanolaser are rigorously investigated. The designed
nanolaser can operate with optical or electric pumping and possesses attributes
of a thresholdless laser due to the high beta-factor and strong Purcell
enhancement in the strongly confined Mie resonance mode. We design a
reconfigurable metasurface composed of lasing-cloaking metaatoms that can
switch from lasing to a nonscattering state in a reversible manner.
