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    • 8. 发明申请
    • METHOD TO MEASURE THE REFRACTIVE INDEX OF A SAMPLE USING SURFACE PLASMON POLARITONS
    • WO2019097024A1
    • 2019-05-23
    • PCT/EP2018/081635
    • 2018-11-16
    • CONSIGLIO NAZIONALE DELLE RICERCHE - CNR
    • GIORGINI, AntonioAVINO, SaverioMALARA, PietroGAGLIARDI, GianlucaDE NATALE, Paolo
    • G01N21/552G01N21/41
    • G01N21/553G01N21/4133
    • The invention relates to a method to measure the refractive index of a sample (24), the method including: •providing a plasmonic sensor (3) capable to allow, upon illumination with electromagnetic radiation, a surface plasmon resonance condition, the plasmonic sensor (3) including a sensing surface (32) in contact with the sample (24) to be measured; •providing an optical resonator (10) having a output channel, the plasmonic sensor (3) being integrated in the optical resonator as a reflecting surface (13) of the same; •providing a first input field (4') of electromagnetic radiation as a primary carrier having a first frequency and having a TE and/or a TM polarized component with respect to the sensing surface (32); • providing a second input field (4') of electromagnetic radiation as a secondary carrier having a second frequency different from the first frequency and defined as: second frequency = first frequency + Δν and having a TE and/or a TM polarized component, the first and second input field being part of the same beam and travelling along the same optical path; • impinging simultaneously with the first and second input field (4, 4') the plasmonic sensor (3) integrated in the optical resonator (10) so as to excite two orthogonal modes of the optical resonator to produce a first and second intra-cavity field in the optical resonator corresponding to the TE or TM component of the first input field (4) and to the TM or TE component of the second input field (4'); tuning the frequency of the first field (4) and/or the value of Δν till the value of the first frequency and the value of the second frequency are such that the first intra-cavity field corresponding to the TE field or TM field component of the first input field (4) is resonating in the optical resonator (10) and the second frequency ( v 2 ) at which the second intra-cavity field corresponding to the TM field or TE field component of the second input field (4') is resonant in the optical resonator (10) simultaneously, obtaining a first resonating frequency and a second resonating frequency; detecting a resonator output power (6) corresponding to the first and second intra-cavity fields resonating in the optical resonator (10); determining a difference between the first resonating frequency ( v 1 ) and the second resonating frequency ( v 2 ); and calculating the refractive index of the sample (24) from the difference between the first and second frequency.