Srinivasan Research Group

Solid-state quantum emitters such as InAs/GaAs quantum dots are key for realizing high-performance, chip-integrated quantum technologies like single-photon sources and single-photon gates.

Photo-induced second harmonic generation (SHG) in silicon photonics is a process in which a DC electric field, generated by a process known as the coherent photogalvanic effect, combines with the medium's third-order optical nonlinearity to create an effective second-order nonlinearity. 

Recently, we demonstrated that this process can be quite efficient in silicon nitride microresonators by resonantly enhancing the interaction of phase- and frequency-matched fundamental and second harmonic modes.

Our research on integrated photonics interposers for microcomb-based systems has been published in Light: Science & Applications. 

Our research on hybridization of circular and rectangular mode profiles in nanophotonics has been published in Optics Letters. 

This work describes how rectangular cross-section waveguides that one might expect to only support modes with rectangular spatial profiles can in fact also support modes with circular spatial profiles, and how such modes can be useful for nonlinear optical processes like third-harmonic generation. 

We have recently published a new approach for realizing quantum frequency conversion across the very large spectral gap between the visible and telecommunications wavelength bands. 

This work, led by Xiyuan Lu, is in Optics Letters, and describes how third-order sum and difference frequency generation in microresonators can be a compelling approach for quantum frequency conversion.

We describe a new approach to 3D printing of micro-optical elements on the facets of photonic chips in Optics Express. 

This work, led by Edgar Perez, shows how we can use machine vision techniques to automatically locate input/output ports on photonic chip facets and directly print micro-lenses on them to aid in fiber optic coupling to and from the chip.

The digital age has seen electronics, including computer chips, shrink in size at an amazing rate, with ever tinier chips powering devices like smartphones, laptops and even autonomous drones. In the wake of this progress, another miniature technology has been gaining steam: integrated photonics. Photons, which are the quantum particles of light, have some advantages over electrons, the namesakes of electronics. For some applications, photons offer faster and more accurate information transfer and use less power than electrons. And because on-chip photonics are largely built using the same technology created for the electronics industry, they carry the promise of integrating electronics and photonics on the same chip.

Greg and Kartik have written a Viewpoint in Physics on a recent paper. 

We are happy to announce that new research on an improved coupled-mode theory for high-index-contrast photonic platforms has been published on Physical Review A. 

Xiyuan's latest research on second harmonic generation (SHG) in silicon nitride ring resonators has been published in Nature Photonics.