Effect of entropic stochastic resonance in a confined structure driven by square-wave signal

► We investigate the entropic stochastic resonance in a confined system. ► The signal-to-noise ratio (SNR) varies non-monotonically with noise strength. ► The SNR varies non-monotonically with the amplitude of the square-wave signal. ► The SNR varies non-monotonically with some parameters of the confined structure.