Projects per year
My primary research interest is the development of novel nanofabricated device platforms for manipulating light and sound waves at the nanoscale and engineering controlled interactions between them, and other solid state systems. My current research thrusts are along three main directions, all underpinned by advances made in my group on pushing the operation frequency and efficiency of light-sound interactions in guided wave devices: building resonant acousto-optic quantum transducers to translate quantum states between the microwave and optical frequency domains for connecting distributed superconducting, spin and trapped ion qubit platforms [Balram et al., Nat. Phot. 2016; Valle et al., Opt. Lett. 2019; Wu et al. Phys. Rev. Appl. 2020]; shrinking mobile RF front-ends by ~100x by applying ideas from integrated photonics to guided wave acoustics [Valle et al., Appl. Phys. Lett. 2019]; and applying modern developments in RF engineering to an old problem (spin detection) and providing a route towards improved sensitivity by ~8 orders of magnitude.
My work pushes the state of the art in nanofabrication methods and, the performance of devices and systems enabled by this establishing Bristol as a centre for excellence in nanofabrication. To enable this, my group also develops novel metrology tools that allows us to probe and quantify wave phenomena at the nanoscale. My interest in metrology is a natural outgrowth of spending three very enjoyable years as a postdoctoral fellow, working with Kartik Srinivasan at NIST Gaithersburg. Before that, I was a PhD student with David Miller at Stanford.
If you are interested in building nanoscale devices to engineer efficient light matter interactions, please drop me an email. A list of PhD projects I am actively looking to recruit on:
- Photonic-phononic integrated circuits for (quantum) microwave to optical signal transduction:
- Cavity QMD: Piezoelectric micro-resonators as efficient near field transducers for readout and manipulation of nanoscale spin systems:
Structured keywords and research groupings
- photonics and quantum
- Quantum Engineering Centre for Doctoral Training
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27/07/21 → 26/07/23
Microwave-to-Optical Transduction Using a Mechanical Supermode for Coupling Piezoelectric and Optomechanical ResonatorsWu, M., Zeuthen, E., Balram, K. C. & Srinivasan, K., 16 Jan 2020, (E-pub ahead of print) In: Physical Review Applied. 13, 1, 014027.
Research output: Contribution to journal › Article (Academic Journal) › peer-reviewOpen AccessFile28 Citations (Scopus)147 Downloads (Pure)
Single photon emission and single spin coherence of a nitrogen vacancy centre encapsulated in silicon nitrideSmith, J., Monroy Ruz, J. A., Rarity, J. & Coimbatore Balram, K., 1 Apr 2020, In: Applied Physics Letters. 116, 13, 5 p., 134001 .
Research output: Contribution to journal › Article (Academic Journal) › peer-reviewOpen Access6 Citations (Scopus)
Suspended gallium arsenide platform for building large scale photonic integrated circuits: passive devicesJiang, P. & Balram, K. C., 5 Apr 2020, In: Optics Express. 28, 8, 10 p., 12262.
Research output: Contribution to journal › Article (Academic Journal) › peer-reviewOpen AccessFile6 Citations (Scopus)80 Downloads (Pure)
Coimbatore Balram, K. (Creator), Valle, S. (Contributor) & Balram, K. (Contributor), University of Bristol, 10 Oct 2019