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We suggest a mechanism for the emergence of a superradiance burst in asubwavelength array of nonlinear classical emitters. We assume that theemitters interact via their common field of radiative response and that theymay have an arbitrary distribution of initially phases. We show that only ifthis distribution is not uniform, a non-zero field of radiative response arisesleading to a superradiance burst. Although this field cannot synchronize theemitters, it forces fast oscillations of a classical nonlinear emitter to havelong-period envelopes. Constructive interference in the envelopes creates alarge dipole moment of the array which results in a superradiance pulse. Theintensity of the superradiance is proportional to the squared number of theemitters, which envelopes participate in the fluctuation.

Superradiance of a subwavelength array of independent classical nonlinear emitters