Microcavities with QWs can be used to study cavity polaritons which are a mixture of photonic modes and quantum well excitons. Major steps performed to observe polaritons are described in following technology papers:

" MBE grown microcavities based on selenium and tellurium compounds", J.-G. Rousset, J. Kobak, E. Janik, T. Jakubczyk, R. Rudniewski, P. Piotrowski, M. Ściesiek, J. Borysiuk, T. Slupinski, A. Golnik, P. Kossacki, M. Nawrocki, W. Pacuski, Journal of Crystal Growth 401, 499 (2014).

"Strong coupling and polariton lasing in Te based microcavities embedding (Cd,Zn)Te quantum wells", J.-G. Rousset, B. Piętka, M. Król, R. Mirek, K. Lekenta, J. Szczytko, J. Borysiuk, J. Suffczyński, T. Kazimierczuk, M. Goryca, T. Smoleński, P. Kossacki, M. Nawrocki, W. Pacuski. Applied Physics Letters 107, 201109 (2015).

"Design and control of mode interaction in coupled ZnTe optical microcavities", M. Ściesiek, W. Pacuski, J-G. Rousset, M. Parlińska-Wojtan, A. Golnik, J. Suffczyński, Cryst. Growth Des. 17, 3716 (2017).

"(Cd,Zn,Mg)Te-based microcavity on MgTe sacrificial buffer: Growth, lift-off, and transmission studies of polaritons", B. Seredyński, M. Król, P. Starzyk, R. Mirek, M. Ściesiek, K. Sobczak, J. Borysiuk, D. Stephan, J.-G. Rousset, J. Szczytko, B. Piętka, W. Pacuski, Phys. Rev. Materials 2, 043406 (2018).

"Direct Interbranch Relaxation of Polaritons in a Microcavity with Embedded CdSe/(Cd,Mg)Se Quantum Wells", K. Sawicki, M. Jurczak, W. Pacuski, J. Suffczyński , Journal of Electronic Materials (2020).

"Universality of open microcavities for stronglight-matter coupling", M. Król, K. Lempicka, K. Rechcinska, M. Furman, K. Nogajewski, R. Mazur, P. Morawiak, W. Piecek, W. Pacuski, J. Szczytko, B. Pietka, Optical Materials Express 13, 2651(2023).

Further, or microcavities were used for various spectacular optical experiments:

"Triple threshold lasing from a photonic trap in a Te/Se-based optical microcavity", K. Sawicki, J.-G. Rousset, R. Rudniewski, W. Pacuski, M. Ściesiek, T. Kazimierczuk, K. Sobczak, J. Borysiuk, M. Nawrocki, J. Suffczyński Communications Physics 2, 38 (2019).

"Polariton lasing and energy-degenerate parametric scattering in non-resonantly driven coupled planar microcavities", K. Sawicki, T. J. Sturges, M. Ściesiek, T. Kazimierczuk, K. Sobczak, A. Golnik, W. Pacuski, J. Suffczyński, Nanophotonics 10, 2421 (2021).     , Press release: EN, PL.

"Natural exceptional points in the excitation spectrum of a light-matter system", A. Opala, M. Furman, M. Król, R. Mirek, K. Tyszka, B. Seredyński, W. Pacuski, J. Szczytko, M. Matuszewski, B. Piętka, Optica 10, 1111 (2023).

"Inverted optical bistability and optical limiting in coherently driven exciton–polaritons", M. Furman, A. Opala, M. Król, K. Tyszka, R. Mirek, M. Muszyński, B. Seredyński, W. Pacuski, J. Szczytko, M. Matuszewski, B. Piętka, APL Photonics 8, 046105 (2023).