Research, 연구


Subwavelength-scale semiconductor light sources for computing and communications

The physical size and effective modal volume of conventional lasers with visible and near-infrared emission wavelengths are usually in the micrometer range due to the diffraction limit. The length scale of electronic transistors, however, is currently sub-100 nm thanks to the advance of fabrication technologies. For future integration of electronic and photonic devices on a chip-scale platform, we need novel light sources that are smaller than such conventional lasers. Our research group uses metallodielectric photonic resonators to surpass the size and modal volume limitations of dielectric cavity structures.  Our recent paper about the nanopatch semiconductor lasers can be accessed here.


 
Subwavelength-scale semiconductor lasers




Nanoscale focusing and manipulation of electromagnetic waves for sensing and energy conversion

Spatial and temporal resolution of imaging systems can be significantly improved by concentrating optical fields in space and time domains, and emerging nanophotonic devices such as optical antennas offer interesting and viable options to confine optical signals within deep-subwavelength scales.  When combined with surface enhanced Raman spectroscopy, intense optical signals within extremely small volume can generate molecule-specific spectral signatures for ultra-sensitive sensing and detection applications.

 


Optical antenna for nanoscale focusing





Integrated photonics and optoelectronics with novel nano-materials

Novel nano-materials, such as nanoparticles, nanowires, and graphene, offer exciting opportunities and challenges in photonics research.  We are investigating applications of such materials for information and energy technologies.



Nanowire photonics
 


Photonics and optomechanics using graphene
 







Nanoparticle photonics



Microphotonics for mobile devices

Most mobile communication devices are now equipped with image sensors and optics (i.e. cell phone cameras) for image/video acquisition.  We are interested in developing novel microphotonic devices and systems that can improve the imaging modality of such mobile image sensors for a number of applications.  More details about our research will be described here soon.