118
4 In the Field of Quantum Technologies
Fig. 4.8 Modelling data for tunable exciton–photon coupling in a planar open Fabry–Pérot-type
optical microcavity with fixed 2D semiconductor sheet on a PMMA buffer on one dielectric end
mirror. The effective cavity length at a given PMMA thickness changes as a function of the incidence angle, which alters the strength of the resonator standing wave’s electric field at the position
of the here employed TMDC monolayer. The structure is sketched in [224]. Here, the air gap for the
second cavity mode increases from about a 361 nm over b 426 nm to c 578 nm. The refractive index
modulation of the empty DBR–DBR cavity with air spacer is displayed for clarity (grey dotted
line, right axis). The simulated field profile (absolute amplitude as a function of distance from the
monolayer in z) is shown at resonance conditions (E C (θ res ) − E X = 0), correspondingly marked in
the calculated angle-dependent reflectivity spectra (d–f) by a vertical dotted line based on neglected
absorption of WS 2 , whereas the exciton’s energy E X (determined by the peak position within the
imaginary part of the complex refractive index ˜
n) is indicated by the horizontal dashed line. Crosssectional spectra for θ res are displayed at the sides of each false-colour reflectivity profile, showing
(d) strong and (e) reduced strong coupling, as well as (f) weak coupling with vanished mode anticrossing. As a supplement for comparison, the situation for the first three cavity modes can be
understood with the help of the Supporting Information Figs. SI.4 and 5 of [224]; in addition, calculated spectra for transmission and absorption corresponding to (d–f) as well as reflectivity spectra
for p-polarised light are provided in Figs. SI.8 and 9, respectively. Reproduced under the terms of
the CC-BY Creative Commons Attribution 4.0 International Licence (http://creativecommons.org/
licenses/by/4.0/). [224] Copyright 2020 The Author(s), published by Springer Nature
this context, the G
(2) second-order temporal autocorrelation function (i.e. photon
statistics) of pulsed condensates in external magnetic fields was studied and the different degrees of coherence for circularly-polarised Zeeman-split spinor condensates
unraveled [143]. The interested reader is referred to the literature on polaritons in
external fields for further details [148].
4 In the Field of Quantum Technologies
Fig. 4.8 Modelling data for tunable exciton–photon coupling in a planar open Fabry–Pérot-type
optical microcavity with fixed 2D semiconductor sheet on a PMMA buffer on one dielectric end
mirror. The effective cavity length at a given PMMA thickness changes as a function of the incidence angle, which alters the strength of the resonator standing wave’s electric field at the position
of the here employed TMDC monolayer. The structure is sketched in [224]. Here, the air gap for the
second cavity mode increases from about a 361 nm over b 426 nm to c 578 nm. The refractive index
modulation of the empty DBR–DBR cavity with air spacer is displayed for clarity (grey dotted
line, right axis). The simulated field profile (absolute amplitude as a function of distance from the
monolayer in z) is shown at resonance conditions (E C (θ res ) − E X = 0), correspondingly marked in
the calculated angle-dependent reflectivity spectra (d–f) by a vertical dotted line based on neglected
absorption of WS 2 , whereas the exciton’s energy E X (determined by the peak position within the
imaginary part of the complex refractive index ˜
n) is indicated by the horizontal dashed line. Crosssectional spectra for θ res are displayed at the sides of each false-colour reflectivity profile, showing
(d) strong and (e) reduced strong coupling, as well as (f) weak coupling with vanished mode anticrossing. As a supplement for comparison, the situation for the first three cavity modes can be
understood with the help of the Supporting Information Figs. SI.4 and 5 of [224]; in addition, calculated spectra for transmission and absorption corresponding to (d–f) as well as reflectivity spectra
for p-polarised light are provided in Figs. SI.8 and 9, respectively. Reproduced under the terms of
the CC-BY Creative Commons Attribution 4.0 International Licence (http://creativecommons.org/
licenses/by/4.0/). [224] Copyright 2020 The Author(s), published by Springer Nature
this context, the G
(2) second-order temporal autocorrelation function (i.e. photon
statistics) of pulsed condensates in external magnetic fields was studied and the different degrees of coherence for circularly-polarised Zeeman-split spinor condensates
unraveled [143]. The interested reader is referred to the literature on polaritons in
external fields for further details [148].