Optical Tamm structures have potential for the development of optoelectronic devices, provided they overcome the challenge of low-quality factor of modes and inherent losses associated with plasmonic metal films. In this work, we present lasing in a super-Tamm structure consisting of a silver thin film deposited on a 4-(dicyanomethylene)-2-methyl-6-(4- dimethylaminostyryl)-H-pyran (DCM) dye-doped polyvinyl alcohol (PVA) spacer layer coated on a SiO2/TiO2 one-dimensional photonic crystal with a lasing threshold of 0.07 mJ. The spectral line narrowing and threshold characteristics observed in the emission spectrum corroborate the realization of a waveguided super-Tamm laser. The bi-exponential temporal decay profile of the Tamm lasing modes with an average lifetime of 0.52 ± 0.02 ns confirms the Purcell enhancement of radiative intensity of the DCM dye when coupled to the super-Tamm modes.
@article{lis_s_purcell_2025,title={Purcell enhanced laser action using a super-{Tamm} cavity mode},volume={50},issn={0146-9592, 1539-4794},url={https://opg.optica.org/abstract.cfm?URI=ol-50-6-1869},doi={10.1364/OL.543288},language={en},number={6},urldate={2025-03-16},journal={Optics Letters},author={Lis S, Sudha Maria and Pandit, Somnath and Patra, Someprosad and Lone, Faizan H. and Singh, Nitesh and Banerjee, Debamalya and Nair, Rajesh V. and Bhaktha B N, Shivakiran},month=mar,year={2025},pages={1869},}
conference articles & others
CLEO 2024
Spatial Correlation of Whispering Gallery Modes in an Active Micro-Bottle Resonator
Subhajit Dutta, Somnath Pandit, and B. N. Shivakiran Bhaktha
The spatio-spectral imaging of active micro-bottle resonator (MBR) is performed and the spatial correlation of the whispering gallery modes (WGMs) are investigated in a dye-doped poly (methyl methacrylate) (PMMA) coated silica micro-bottle resonator.
@inproceedings{dutta_spatial_2024,address={Charlotte, North Carolina},title={Spatial {Correlation} of {Whispering} {Gallery} {Modes} in an {Active} {Micro}-{Bottle} {Resonator}},isbn={978-1-957171-39-5},url={https://opg.optica.org/abstract.cfm?URI=CLEO_AT-2024-JTu2A.10},doi={10.1364/CLEO_AT.2024.JTu2A.10},language={en},urldate={2024-09-12},booktitle={{CLEO} 2024},publisher={Optica Publishing Group},author={Dutta, Subhajit and Pandit, Somnath and Shivakiran Bhaktha, B. N.},year={2024},pages={JTu2A.10},}
CLEO 2023
Tamm Mode-Aided Amplified Spontaneous Emission in One-Dimensional Photonic Crystal Super-Tamm Structure
Sudha Maria Lis S, Somnath Pandit, Someprosad Patra, and 2 more authors
The optical Tamm mode-aided amplified spontaneous emission in a super-Tamm structure consisting of a silver (Ag) thin film deposited on dye-doped polyvinyl alcohol (PVA) layer coated on a SiO2/TiO2 one-dimensional photonic crystal structure is presented.
@inproceedings{S:23,author={S, Sudha Maria Lis and Pandit, Somnath and Patra, Someprosad and Banerjee, Debamalya and N, Shivakiran Bhaktha B},booktitle={CLEO 2023},journal={CLEO 2023},keywords={Atomic force microscopy; Modes; Photonic crystals; Scanning electron microscopy; Thin films; Titanium dioxide},pages={FF2D.4},publisher={Optica Publishing Group},title={Tamm Mode-Aided Amplified Spontaneous Emission in One-Dimensional Photonic Crystal Super-Tamm Structure},year={2023},url={https://opg.optica.org/abstract.cfm?URI=CLEO_FS-2023-FF2D.4},doi={10.1364/CLEO_FS.2023.FF2D.4},}