A detecting device configured to detect chemical or biological species in a given environment, the detecting device comprising: - a matrix-array sensor comprising: ∘ a plurality of optical waveguides, and a plurality of actuating electrodes; ∘ a set of opto-mechanical discs arranged in rows and columns, the discs of a given row being optically coupled to the same optical waveguide, each opto-mechanical disc being optically and mechanically resonant and being able to bind to species of the environment, the actuating electrodes being configured to ensure mechanical resonance of the opto-mechanical discs; and - an emitting unit comprising at least one laser source configured to generate an optical signal carried at an emission wavelength, the emitting unit being further configured to inject the optical signal into the optical waveguides of the matrix-array sensor; characterised in that the matrix-array sensor also comprises: - a plurality of biasing electrodes; and - a plurality of PN junctions, each PN junction being associated with one opto-mechanical disc, the PN junctions of a given column being electrically connected to the same biasing electrode, each PN junction being configured to block the flow through the corresponding opto-mechanical disc of a parasitic electrical current originating from a source other than the biasing electrode to which the PN junction is connected; and in that the device also comprises: - a control circuit configured to forward bias, during a time window of read-out of a disc of interest, the PN junction of the disc of interest so as to place, via a thermo-optical effect, its resonant wavelength at a working wavelength, said working wavelength being chosen so that the strength of the optical signal propagating through the optical waveguide associated with the disc of interest is modulated by said disc of interest, thus delivering a modulated optical signal; and - a read-out circuit configured to determine, on the basis of the modulated optical signal, a local detection result during the time window of read-out of the disc of interest. - a matrix-array sensor comprising: ∘ a plurality of optical waveguides, and a plurality of actuating electrodes; ∘ a set of opto-mechanical discs arranged in rows and columns, the discs of a given row being optically coupled to the same optical waveguide, each opto-mechanical disc being optically and mechanically resonant and being able to bind to species of the environment, the actuating electrodes being configured to ensure mechanical resonance of the opto-mechanical discs; and ∘ a plurality of optical waveguides, and a plurality of actuating electrodes; ∘ a set of opto-mechanical discs arranged in rows and columns, the discs of a given row being optically coupled to the same optical waveguide, each opto-mechanical disc being optically and mechanically resonant and being able to bind to species of the environment, the actuating electrodes being configured to ensure mechanical resonance of the opto-mechanical discs; and - an emitting unit comprising at least one laser source configured to generate an optical signal carried at an emission wavelength, the emitting unit being further configured to inject the optical signal into the optical waveguides of the matrix-array sensor; - a plurality of biasing electrodes; and - a plurality of PN junctions, each PN junction being associated with one opto-mechanical disc, the PN junctions of a given column being electrically connected to the same biasing electrode, each PN junction being configured to block the flow through the corresponding opto-mechanical disc of a parasitic electrical current originating from a source other than the biasing electrode to which the PN junction is connected; - a control circuit configured to forward bias, during a time window of read-out of a disc of interest, the PN junction of the disc of interest so as to place, via a thermo-optical effect, its resonant wavelength at a working wavelength, said working wavelength being chosen so that the strength of the optical signal propagating through the optical waveguide associated with the disc of interest is modulated by said disc of interest, thus delivering a modulated optical signal; and - a read-out circuit configured to determine, on the basis of the modulated optical signal, a local detection result during the time window of read-out of the disc of interest.