8.6 Functional Nanomaterials Sciences Cooperation Group
245
Fig. 8.4 Tunable open-cavity microresonator designs for variable light–matter coupling with 2D
membranes, employing dielectric mirror coatings on planar transparent substrates or fibre tips.
Different monolayer positions with respect to the cavity mode field result in different coupling
strengths, indicated spectrally to the right. Corresponding experimental studies were defined within
the frame of “2RESONATE” and supported by recent theoretical modelling [95] for two WS 2 –
microcavity configurations
route towards condensation studies at room temperature owing to their extraordinarily large exciton binding energies for a quantum-well-like semiconducting material
[74, 130]. Based on recently reported microcavities [112], the author plans to observe
polaritons by coupling excitons of suitable 2D semiconductors with reasonably-wellconfined light fields in tunable and open (fully or partially fibre-based) microcavities
(Fig. 8.4). Based on calculations for such 2D–cavity systems [95], even a smooth
transition between the weak and the strong coupling of the cavity mode with the 2D
exciton resonance (across the exceptional point) could be in principle probed with
the two proposed design concepts—by smoothly modifying the effective coupling
constant g = 0 (θ, r, L cav ) = Rabi , with θ the adjustable incidence angle, r the
variable emitter location in the field, and L cav the tunable cavity length.
It is envisioned that joint development and experimentation on these 2D–cavity
systems—with internal feedback loops on production and characterisation results,
as well as with advanced in/out-coupling and contacting schemes (Fig. 8.5)—will
enable advanced achievements in light–matter coupling experiments
4 . These could
one day lead to the observation of (valley-polarised) Bose–Einstein-like polariton
condensation with 2D materials (and ideally with helicity-selective cavities), at room
temperature. These goals could be seen in the frame of the overarching “2RESONATE” subject of the author’s research, promising further interesting developments
(Fig. 8.6).
4 In general terms light–matter interfaces.
245
Fig. 8.4 Tunable open-cavity microresonator designs for variable light–matter coupling with 2D
membranes, employing dielectric mirror coatings on planar transparent substrates or fibre tips.
Different monolayer positions with respect to the cavity mode field result in different coupling
strengths, indicated spectrally to the right. Corresponding experimental studies were defined within
the frame of “2RESONATE” and supported by recent theoretical modelling [95] for two WS 2 –
microcavity configurations
route towards condensation studies at room temperature owing to their extraordinarily large exciton binding energies for a quantum-well-like semiconducting material
[74, 130]. Based on recently reported microcavities [112], the author plans to observe
polaritons by coupling excitons of suitable 2D semiconductors with reasonably-wellconfined light fields in tunable and open (fully or partially fibre-based) microcavities
(Fig. 8.4). Based on calculations for such 2D–cavity systems [95], even a smooth
transition between the weak and the strong coupling of the cavity mode with the 2D
exciton resonance (across the exceptional point) could be in principle probed with
the two proposed design concepts—by smoothly modifying the effective coupling
constant g = 0 (θ, r, L cav ) = Rabi , with θ the adjustable incidence angle, r the
variable emitter location in the field, and L cav the tunable cavity length.
It is envisioned that joint development and experimentation on these 2D–cavity
systems—with internal feedback loops on production and characterisation results,
as well as with advanced in/out-coupling and contacting schemes (Fig. 8.5)—will
enable advanced achievements in light–matter coupling experiments
4 . These could
one day lead to the observation of (valley-polarised) Bose–Einstein-like polariton
condensation with 2D materials (and ideally with helicity-selective cavities), at room
temperature. These goals could be seen in the frame of the overarching “2RESONATE” subject of the author’s research, promising further interesting developments
(Fig. 8.6).
4 In general terms light–matter interfaces.