@article{mehta_chien_lei_gundogdu_chang_so_2024, title={Hybrid Laser Cavity Design for Improved Photon Lifetime and Performance}, volume={36}, ISSN={["1941-0174"]}, DOI={10.1109/LPT.2024.3374261}, abstractNote={We report an optical cavity design that combines a distributed feedback (DFB) cavity as the primary feedback element for lasing with a silver mirror acting as a Fabry-Pérot cavity for broadband reflection and mode confinement. To evaluate the design, we studied the effects of the silver mirror by excluding the DFB cavity and compared its amplified spontaneous emission (ASE) properties with the sample without the mirror. In the structure with the mirror, the gain medium undergoes ASE at an excitation fluence of <inline-formula> <tex-math notation="LaTeX">$17.5\,\,\mathrm { {\mu J c}}\mathrm {m}^{\mathrm {-2}}$ </tex-math></inline-formula> compared to <inline-formula> <tex-math notation="LaTeX">$37\,\,\mathrm { {\mu J c}}\mathrm {m}^{\mathrm {-2}}$ </tex-math></inline-formula> for the sample without the mirror. This lower ASE threshold is attributed to enhanced mode confinement and photon density of states (PDOS) from the silver mirror increasing the cavity photon lifetime (<inline-formula> <tex-math notation="LaTeX">$ {\tau }_{\mathrm {c}}\mathrm {)}$ </tex-math></inline-formula>. Using this hybrid cavity, a multimode optically pumped laser with a threshold of <inline-formula> <tex-math notation="LaTeX">$42\,\,\mathrm { {\mu J c}}\mathrm {m}^{\mathrm {-2}}$ </tex-math></inline-formula> is demonstrated. This hybrid cavity design offers an effective solution that can be readily applied to other thin film-based laser devices.}, number={7}, journal={IEEE PHOTONICS TECHNOLOGY LETTERS}, author={Mehta, Yash and Chien, Kun-Chieh and Lei, Lei and Gundogdu, Kenan and Chang, Chih-Hao and So, Franky}, year={2024}, month={Apr}, pages={516–519} }
 @article{moon_mehta_gundogdu_so_gu_2023, title={Metal-Halide Perovskite Lasers: Cavity Formation and Emission Characteristics}, volume={7}, ISSN={["1521-4095"]}, DOI={10.1002/adma.202211284}, abstractNote={Abstract}, journal={ADVANCED MATERIALS}, author={Moon, Jiyoung and Mehta, Yash and Gundogdu, Kenan and So, Franky and Gu, Qing}, year={2023}, month={Jul} }
 @article{biliroglu_findik_mendes_seyitliyev_lei_dong_mehta_temnov_so_gundogdu_2022, title={Room-temperature superfluorescence in hybrid perovskites and its origins}, volume={16}, ISSN={["1749-4893"]}, url={https://doi.org/10.1038/s41566-022-00974-4}, DOI={10.1038/s41566-022-00974-4}, number={4}, journal={NATURE PHOTONICS}, publisher={Springer Science and Business Media LLC}, author={Biliroglu, Melike and Findik, Gamze and Mendes, Juliana and Seyitliyev, Dovletgeldi and Lei, Lei and Dong, Qi and Mehta, Yash and Temnov, Vasily V. and So, Franky and Gundogdu, Kenan}, year={2022}, month={Apr}, pages={324-+} }
 @article{fu_mehta_chen_lei_zhu_barange_dong_yin_mendes_he_et al._2021, title={Directional Polarized Light Emission from Thin‐Film Light‐Emitting Diodes}, volume={33}, ISSN={0935-9648 1521-4095}, url={http://dx.doi.org/10.1002/adma.202006801}, DOI={10.1002/adma.202006801}, abstractNote={Abstract}, number={9}, journal={Advanced Materials}, publisher={Wiley}, author={Fu, Xiangyu and Mehta, Yash and Chen, Yi‐An and Lei, Lei and Zhu, Liping and Barange, Nilesh and Dong, Qi and Yin, Shichen and Mendes, Juliana and He, Siliang and et al.}, year={2021}, month={Jan}, pages={2006801} }
 @article{fu_chen_shin_mehta_chen_barange_zhu_amoah_chang_so_2020, title={Recovering cavity effects in corrugated organic light emitting diodes}, volume={28}, ISSN={["1094-4087"]}, DOI={10.1364/OE.404412}, abstractNote={Cavity effects play an important role in determining the out-coupling efficiency of an OLED. By fabricating OLEDs on corrugated substrates, the waveguide and SPP modes can be extracted by diffraction. However, corrugation does not always lead to an enhancement in out-coupling efficiency due to the reduction of the electrode reflectance and hence the cavity effects. Based on the results of our rigorous couple-wave analysis (RCWA) simulation, we found that the cavity effects can be partially recovered using a low index Teflon layer inserted between the ITO anode and the substrate due to the enhancement of the reflectance of the corrugated electrodes. To verify the simulation results, we fabricated corrugated OLEDs having a low-index Teflon interlayer with an EQE of 36%, which is 29% higher than an optimized planar OLED. By experimentally measuring the OLED air mode dispersion, we confirm the cavity emission of a corrugated OLED is enhanced by the low index layer.}, number={21}, journal={OPTICS EXPRESS}, author={Fu, Xiangyu and Chen, Yi-An and Shin, Dong-Hun and Mehta, Yash and Chen, I-Te and Barange, Nilesh and Zhu, Liping and Amoah, Stephen and Chang, Chih-Hao and So, Franky}, year={2020}, month={Oct}, pages={32214–32225} }