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The resonance characteristics of the Fabry-Pérot resonator modes supported by metal/dielectric/metal planar structures are studied in the case of absorbing media for near-to-normal light incidence. Approximations based on rigorous solution and field-transfer model for the field and resonance line shapes in spectra are attributed to the class of Fano and Lorentz resonances. The analytical expressions are obtained for the propagation constant and field enhancement of the mode, width, height and slope of resonance line shapes in spectra as functions of structural parameters. With estimation of field characteristics of the fabricated loss structures based on aluminum and quartz, the peaks in the transmission spectra can be attributed to the excitation of Fabry-Pérot modes. Fundamental characterization of Fabry-Pérot resonances may find applications in optical processing and sensing.

E-polarized oscillations in open multimirror resonator have been investigated. One of the mirrors of the open resonator is defined as an echelette grating with equal steps. Spectra and field topology of the Epolarized oscillations of resonator are derived theoretically and experimentally at 8 mm wave band. [ABSTRACT FROM AUTHOR]

This paper deals with ratios between the order of the system of linear algebraic equations for the amplitudes of oscillations in resonators and the number of accountable space harmonics that give the most precise solution of dispersion equation for open comb with combs of infinite thickness, using the method of partial areas. We also reveal the dependence between relative difference of the method of partial areas and the factorization method as well as phase shift of zero space harmonic at the period of the comb. [ABSTRACT FROM AUTHOR]