Amir Hassanpour, Ph. D. student
E-mail: amirPHYS.hassanpour AT concordia.ca (remove the PHYS)
Growth and fabrication of ZnO optical microresonators
Bianucci Research Group
Our research is mostly based on optical microresonators, microscopic structures that can maintain light confined within them. We interrogate them using optical fibers (that have been tapered to a diameter comparable to the wavelength of near-infrared light) and free-space lasers.
Some of the projects we are interested in are:
- Studying the optical properties of nanomaterials coupled to microresonators.
- Designing and implementing micro- and nanophotonics devices.
- Investigating ultra-sensitive biosensors (in collaboration with Microphotonics Laboratory at Ecole Polytechnique de Montreal).
- Fast and slow light in microresonators.
- Solid-state quantum optics.
- K. McGarvey-Lechable, and P. Bianucci, "Maximizing slow-light enhancement in one-dimensional photonic crystal ring resonators", Optics Express 22, 26032 (2014) .
- M. H. Tavakoli-Dastjerdi, M. Djavid, S. Arafin, X. Liu, P. Bianucci, Z. Mi, and P. J. Poole,“Optically pumped rolled-up InAs/InGaAsP quantum dash lasers at room temperature”, Semiconductor Science and Technology 28, 094007 (2013)
P. Bianucci, S. Mukherjee, M. H. Tavakoli-Dastjerdi, P. J. Poole, and Z. Mi,“InGaAsP/InAs quantum dot microtube lasers”, Applied Physics Letters 101, 031104–4 (2012)
- P. Bianucci, X. Wang, J. G. C. Veinot and A. Meldrum, "Silicon Nanocrystals on Bottle Resonators: Mode Structure, loss mechanisms and emission dynamics", Optics Express 18, 8466 (2010)
- P. Bianucci, J. R. Rodriguez, C. Clements, J. G. C. Veinot and A. Meldrum, "Silicon nanocrystal luminescence coupled to whispering gallery modes in optical fibers", Journal of Applied Physics 105, 023108 (2009)
- P. Bianucci, C. R. Fietz, J. W. Robertson, G. Shvets and C. K. Shih, "Observation of simultaneous fast and slow light", Physical Review A 77, 053816 (2008) arXiv:0803.1216
- P. Bianucci, C. R. Fietz, J. W. Robertson, G. Shvets and C. K. Shih, "Whispering gallery mode microresonators as polarization converters", Optics Letters 32, 2224 (2007)
- P. Bianucci, C. R. Fietz, J. W. Robertson, G. Shvets and C. K. Shih, "Polarization conversion in a silica microsphere", Optics Express 15, 6999 (2007) arXiv:0704.0422
- P. Bianucci, A. Muller, Q. Q. Wang, C. K. Shih, C. Piermarocchi, Q. K. Xue, "Experimental realization of the one qubit Deutsch-Jozsa algorithm in a quantum dot", Physical Review B 69, 161303R (2004) cond-mat/0401226
The optical properties of semiconductor nanostructures are incredibly rich. We are setting up a micro-photoluminescence (micro-PL) system that will allow us to study the light emission from nanostructures. We can grown our own ZnO nanowires using a solution-based method, in collaboration with Dr. John Capobianco in the Department of Chemistry and Biochemistry.
We also use optical microresonators with embedded nanomaterials to how the presence of the material changes the properties of the microresonator and viceversa.
Photonics is using light to transfer and process information instead of electrons. Thanks to the properties of photons (the virtual particles that carry light), photonics has the potential for creating faster and more power-efficient devices than electronics. One of the building blocks for photonic circuits is the optical micro-resonator, which keeps light confined in both space and time. Micro-resonators are the basis of many photonic devices, such as filters, modulators, delay lines, etc. We are interested in exploring optical micro-resonators with new geometries and materials for creating new micro- and nanophotonic devices.
The optical characteristics of microresonators, in particular their resonant wavelengths, are very sensitive to changes in their environment. We can use this to make very sensitive optical sensors, which let us measure minute changes in refraction index, concentration, or even the presence of nanoparticles, viruses, or bacteria.
The sharp spectral response of low-loss optical micro-resonators can give rise to significant changes in the group delay of pulses propagating through waveguides coupled to them. We are interested in studying these kind of effects, and to harness them for making new photonic devices.
Amir Hassanpour, Ph. D. student
Tabassom Hamidfar, Ph. D. student
Kathleen McGarvey-Lechable, Ph. D. student
Christine Thompson, Ph. D. student
Resonant modes of periodic structures
Fabrication of tapered optical fibers
Growth of ZnO nanowires (SCOL 290)
Our laboratory in located in the 5th floor of the Science Pavillion (SP) on the Loyola campus. Right now is under renovations, but soon we'll start setting up our equipment!
Optical table: We have a Newport ST-UT2 optical table with active vibration damping for our optical setups