51 citations · 151 across the 7 of their papers we have counts for
7 papers
Directional Emission From High-Q Asymmetric Hollow Whispering Gallery Resonators
Amal Jose, Ramgopal Madugani, Christophe Pin +1
Whispering gallery mode (WGM) resonators with broken rotational symmetry exhibit phenomena that are generally absent in conventional symmetric cavities, including directional emiss…
Spectral and spatial filtering of whispering gallery modes in precision-engineered microbubble resonators
Ramgopal Madugani, Amal Jose, Christophe Pin +3
Similar to microspheres, thin-walled microbubble resonators support whispering gallery modes (WGMs) that combine ultrahigh Q-factors and small effective mode volumes. In contrast,…
Broadband Optomechanical Sensing at the Thermodynamic Limit
Feng Zhou, Yiliang Bao, Ramgopal Madugani +3
Cavity optomechanics has opened new avenues of research in both fundamental physics and precision measurement by significantly advancing the sensitivity achievable in detecting att…
Cavity ring-up spectroscopy for dissipative and dispersive sensing in a whispering gallery mode resonator
Yong Yang, Ramgopal Madugani, Sho Kasumie +2
In whispering gallery mode resonator sensing applications, the conventional way to detect a change in the parameter to be measured is by observing the steady state transmission spe…
Linear Laser Tuning Using a Pressure-Sensitive Microbubble Resonator
Ramgopal Madugani, Yong Yang, Vu H Le +2
The tunability of an optical cavity is an essential requirement for many areas of research. Here, we use the Pound-Drever-Hall technique to lock a laser to a whispering gallery mod…
Optomechanical Transduction and Characterization of a Silica Microsphere Pendulum via Evanescent Light
Ramgopal Madugani, Yong Yang, Jonathan M Ward +2
Dissipative optomechanics has some advantages in cooling compared to the conventional dispersion dominated systems. Here, we study the optical response of a cantilever-like, silica…
TeraHz tuning of whispering gallery modes in a PDMS, stand-alone, stretchable microsphere
Ramgopal Madugani, Yong Yang, Jonathan M Ward +7
We report on tuning the optical whispering gallery modes in a poly dimethyl siloxane-based (PDMS) microsphere resonator by more than a THz. The PDMS microsphere system consists of…