RESUMO
Metal nanoparticles (NPs) can be employed to modify the emission level of a dye emitter by tailoring the spectral overlap of the optical gain and localized surface plasmon resonance (LSPR). In the case of plasmonic random lasers, tuning the spectral overlap by manipulating metal NPs changes the scattering properties of the system, which is crucial in random lasers (RLs). In order to overcome this drawback, the emitter gain spectrum across the LSPR is tuned by appropriately choosing various dye emitters. A system with Au nanoislands (NIs) randomly distributed on the surface of vertically aligned ZnO nanorods on a glass substrate coated with three different dye emitters has been employed to study the metal-gain interaction as a function of spectral overlap. It is observed that the photoluminescence is quenched in the presence of Au NIs for all the three dye emitters; however, the degree of quenching is found to be directly proportional to the extent of spectral overlap of the LSPR and the fluorophore emission spectrum, with the resonantly coupled systems exhibiting higher random lasing thresholds. However, a dequenching of the emission is observed under spectrally off-resonant conditions, leading to a lower threshold RL. The effect of tailoring of the metal-gain interaction on the coherent and incoherent intensity components of RL emission is studied to elucidate the contrasting results of photoluminescence and RL emission. As the optical gain shifts away from the LSPR peak, the RL emission is dominated by the coherent intensity. The speckle-like field distributions of the RL modes couple to the plasmonic nanocavities along with a reduced absorption loss for the off-resonant case, leading to an enhanced stimulated emission. Hence, a synergy between random laser modes, plasmonic nanocavities and optimum spectral overlap has been utilized as a tool to dequench the plasmon quenched fluorophore emission.
RESUMO
BACKGROUND: Domestic violence is a deeply entrenched issue in Indian society, with global implications, especially for women's physical and mental health. Healthcare providers play important role in early identification and support of the victims. Medical interns, the future generation of Health care professionals, often acting as primary caregivers are uniquely positioned and expected to recognize and assist victims. This study aims to evaluate their knowledge, attitudes, practices, and readiness to manage domestic violence and its associating factors. METHODS: This cross-sectional study was conducted among 157 medical interns at a Medical college and hospital in West Bengal, India, from December 2022 to February 2023. Simple random sampling was done. Data were collected using a semi-structured questionnaire, Medical Intern Readiness to manage domestic violence scale (MIREDS), validated after adoption from Physician Readiness to manage Intimate partner violence scale (PREMIS). Ethical approval was obtained, and participants gave informed written consent for inclusion. Satisfactory threshold was determined to be more than 50 percent. Data analysis was performed using MS Excel and SPSS software, including descriptive and inferential statistics, with a significance level of p less than 0.05, along with logistic regression analysis. RESULTS: Only 45.2% of medical interns demonstrated satisfactory knowledge, 54.8% had a satisfactory attitude. Most interns (91.7%) exhibited poor practice in dealing with domestic violence cases, only 31.2% considered themselves ready to manage domestic violence cases. Interns who attend more patients was found to have better attitude. Positive associations were found between knowledge, attitude, and readiness to manage domestic violence cases among doctors . CONCLUSIONS: A substantial proportion of medical interns demonstrated inadequate knowledge, negative attitudes, and poor practice and inadequate readiness to manage domestic violence. Comprehensive training and education with cultural sensitivity training along with more practical exposures are in need to address this issue properly.