This dataset contains simulation and experimental data presented in the paper titled 'Frequency tunability and spectral control in terahertz quantum cascade lasers with phase-adjusted finite-defect site photonic lattices'

Fig_1a.xlsx contains experimental data of light-current-voltage characterisation obtained from an unpatterned THz QCL. This data corresponds to Fig. 1(a) of the paper.

Fig_1b.xlsx contains experimentally recorded and processed spectra at different drive currents, obtained from an unpatterned THz QCL. This data corresponds to Fig. 1(b) of the paper.

Fig_1c.xlsx contains experimentally recorded and processed spectra at a drive current of 1.10A and at different heat sink temperatures, obtained from an unpatterned THz QCL. This data corresponds to Fig. 1(c) of the paper.

Fig_3.xlsx contains data from simulation of normalised transmission from PL-QCLs at PL duty cycles 0.50 and 0.75 (with and without a central defect). This data corresponds to Fig. 3 of the paper.

Fig_4b.xlsx contains data from simulation of normalised transmission from PL-QCLs at different values of displacement, M. This data corresponds to Fig. 4(b) of the paper.

Fig_5.xlsx contains data from simulation of normalised transmission from three THz PL-QCL designs discussed in the paper optimised to obtain continuous tuning, discrete tuning and multiple mode emission with an engineered mode spacing. This data corresponds to Fig. 5 of the paper.

Fig_6a.xlsx contains experimental data of light-current-voltage characterisation obtained from a THz PL-QCL (device 1). This data corresponds to Fig. 6(a) of the paper.

Fig_6b_SMSR.xlsx contains SMSR from a PL-QCL (calculated from experimentally recorded data) as a function of drive current and heat sink temperature. This data corresponds to Fig. 6(b) SMSR of the paper.

Fig_6b_Freq.xlsx contains peak emission frequency from a PL-QCL (calculated from experimentally recorded data) as a function of drive current and heat sink temperature, and an exemplar spectra showing a side mode suppression of 40dB. This data corresponds to the peak emission frequency and inset in Fig. 6(b) of the paper.

Fig_6c.xlsx contains experimentally recorded and processed spectra from different PL-QCLs lasing at frequencies 2.21, 2.52, 2.99, 3.44, and 4.99THz. This data corresponds to Fig. 6(c) of the paper.

Fig_7a.xlsx contains experimental data of light-current-voltage characterisation obtained from device 2. This data corresponds to Fig. 7(a) of the paper.

Fig_7b.xlsx contains experimentally recorded and processed spectra from a PL-QCL at different laser drive currents at a heat sink temperature of 30K. This data corresponds to Fig. 7(b) of the paper.

Fig_7c.xlsx contains peak emission frequency from a PL-QCL (calculated from experimentally recorded data) as a function of drive current and heat sink temperature, and exemplar spectra showing side mode suppression of 40dB. This data corresponds to Fig. 7(c) inset of the paper.

Fig_7d.xlsx contains experimentally recorded and processed spectra from two different PL-QCLs (following design 2) at different laser drive currents. This data corresponds to Fig. 7(d) inset of the paper.

Fig_8a.xlsx contains experimental data of light-current-voltage characterisation obtained from device 3. This data corresponds to Fig. 8(a) of the paper.

Fig_8b.xlsx contains experimentally recorded and processed spectra from a PL-QCL at different laser drive current densities showing multiple mode emission with a longitudinal mode spacing of 28GHz. This data corresponds to Fig. 8(b) of the paper.

Fig_8c.xlsx contains experimentally recorded and processed spectra from a PL-QCL showing multiple mode emission with a longitudinal mode spacing of 26GHz. This data corresponds to Fig. 8(c) of the paper.

Fig_8d.xlsx contains data from simulation of normalised transmission from a second order PL-QCL with a mode spacing of 47 GHz. This data corresponds to Fig. 8(d) of the paper.