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The photo-response of a thin current-carrying superconducting stripe with a90-degree turn is studied within the time-dependent Ginzburg-Landau theory. Weshow that the photon acting near the inner corner (where the current density ismaximal due to the current crowding [J. R. Clem and K. K. Berggren, Phys. Rev.B {\bf 84}, 174510 (2011)]) triggers the nucleation of superconducting vorticesat currents much smaller than the expected critical one, but {\it does not}bring the system to a higher resistive state and thus remains undetected. Thetransition to the resistive state occurs only when the photon hits the stripeaway from the corner due to there uniform current distribution across thesample, and dissipation is due to the nucleation of a kinematicvortex-antivortex pair near the photon incidence. We propose strategies toaccount for this problem in the measurements.

Spatially-dependent sensitivity of superconducting meanders as single-photon detectors