New mechanism to generate and reconfigure circularly polarized light
Spin-polarized or circularly polarized light is of vital importance in fundamental and applied sciences. It is typically obtained using either chiral light sources (structural chirality) or polarization conversion devices such as quarter wave plates.
In our recent work, we found a new mechanism based on near-field coupling between antennas at unequal temperatures.
Interestingly, with this mechanism, the polarization state of light can be reconfigured by simply interchanging the temperatures of the antennas.
New solid-state thermal refrigeration scheme using laser light and nonlinear four-wave mixing
Many semiconductor and superconductor based devices (e.g. detectors, quantum computer) require cryogenic temperatures (around or below 100K) which is achieved using bulky mechanical refrigerators. Alternative technology small in size and mass which satisfies power and stability requirements is desired.
In a recent work, we have proposed a new solid-state refrigeration mechanism. It is based on nonlinearly upconverting and extracting the thermal energy of phonons using a laser light. This mechanism can realize efficient refrigeration for a wide range of operational temperatures (from tens to hundreds of Kelvin) using GW/m2 laser power.
Thermal Memory Device to store information in the form of temperature
A thermal memory device requires thermal multistability where the same object can exhibit multiple temperature states while being in steady state with its environment. In this work, we show that thermal bistability can be engineered over a wide temperature range using photonic resonances and thermo-optic materials. Such a device could be useful at high temperatures where traditional Si-based electronic memories fail.