Abstract
The authors present here designs for tuneable confined Tamm plasmons (CTPs) resonant at 1.3 μm, consisting of an AlAs/GaAs distributed Bragg reflector and gold disc. Using numerical methods they explored the effect of disc diameter on the CTP resonance and position of a dipole source (modelling a quantum dot) on emission through the disc. They found decreasing disc diameter resulted in a blue-shifted fundamental mode and that a dipole positioned at the centre of the disc emitted with an angular distribution that collected 90% of the transmitted power within a numerical aperture of 0.7. They also explore the Purcell enhancement under the CTP as a function of dipole position.
Highlights
Semiconductor quantum dots (QDs) are an attractive solidstate source of single photons and other quantum states, such as entangled photons
Adding the metallic layer shows the appearance of the Tamm Plasmons (TPs) as a dip in the reflectivity at λTP = 1304 nm. This occurs due to light at wavelengths close to the resonance coupling into the TP mode and being guided into the spacer layer, instead of being reflected
We explore the effect of confinement and effect of source position with respect to the disk on the emission properties
Summary
Semiconductor quantum dots (QDs) are an attractive solidstate source of single photons and other quantum states, such as entangled photons. The top layer of the dielectric, labelled the spacer layer, must have the higher of the two refractive indices of the DBR [10] The interaction between these modes and QD emitters compares favourably to other surface-confined optical modes, such as surface plasmon polaritons: the majority of the mode is located within the lossless, photonic material; they have a parabolic dispersion that is within the light cone, so can be excited without requiring momentum-matching components which complicate miniaturization [11]; and they can be excited with both TE and TM polarized light. Layer (red line) shows the appearance of the TP as a dip in the reflectivity at λTP = 1304 nm This occurs due to light at wavelengths close to the resonance coupling into the TP mode and being guided into the spacer layer, instead of being reflected. The shift in the mode resonance is small for variations in the Au layer and large for the spacer layer; by changing the spacer thickness from 40 nm to 100 nm the TP mode can effectively cover nearly the full range of the O-band (1260 nm to 1360 nm) without significant variation of quality factor
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