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Spectrally-tailored interactions of light with material interfaces offer manyexciting applications in sensing, photo-detection, and optical energyconversion. In particular, complete suppression of light reflectance at selectfrequencies accompanied by sharp phase variations in the reflected signal formsthe basis for the development of ultra-sensitive singular-phase opticaldetection schemes such as Brewster and surface plasmon interferometry. However,both the Brewster effect and surface-plasmon-mediated absorption on planarinterfaces are limited to one polarization of the incident light and obliqueexcitation angles, and may have limited bandwidth dictated by the materialdielectric index and plasma frequency. To alleviate these limitations, wedesign narrow-band super-absorbers composed of plasmonic materials embeddedinto dielectric photonic nanostructures with topologically-protectedinterfacial Tamm plasmon states. These structures have planar geometry and donot require nanopatterning to achieve perfect absorption of both polarizationsof the incident light in a wide range of incident angles, including the normalincidence. Their absorption lines are tunable across a very broad spectralrange via engineering of the photon bandstructure of the dielectric photonicnanostructures to achieve reversal of the geometrical phase across theinterface with the plasmonic absorber. We outline the design strategy toachieve perfect absorptance in Tamm structures with dissipative losses viaconjugate impedance matching. We further demonstrate via modeling how thesestructures can be engineered to support sharp asymmetric amplitude resonances,which can be used to improve the sensitivity of optical sensors in theamplitude-only detection scheme that does not require use of bulky andexpensive ellipsometry equipment.

Sensitive singular-phase optical detection without phase measurements with Tamm plasmons