Novel nano-structured materials and opto-electronic devices for classical and quantum optical applications

Speaker: 
Johann Peter Reithmaier (Uni. Kassel)
Event Date and Time: 
Thu, 2017-02-02 16:00 - 17:00
Location: 
Hennings 201
Local Contact: 
Jeff Young
Intended Audience: 
Undergraduate

With the improved control of nano-scale dimensions, material and device properties can be optimized towards their quantum mechanical limits. For example, atom-like features, such as discrete energy levels, may allow the optimum carrier distribution for stimulated emission in lasers, resulting in improved device performance in comparison to conventional quantum well technology. However, if one wants to utilize the quantum nature of single nano objects (e.g., for single photon emission), then the control of the environment and of the individual object geometry is also important.   

An overview will be given of our recent work, which focusses mainly on InP-based nanostructured materials covering the wavelength range near 1.5 µm and addressing different applications in classical as well as in quantum optical communication.  In particular, a breakthrough in quantum dot (QD) laser materials has been obtained by reducing the inhomogeneous linewidth broadening in QD ensembles grown by molecular beam epitaxy.  InP-based photonic crystal technology has intrinsic advantages in comparison to the more common GaAs or Si-based technology platforms.  Some application examples will be discussed. addressing low-power all-optical switching at 1.5 µm using a two-resonant photonic molecule design.  By additionally embedding QDs into a photonic crystal nano-cavity membrane structure, a fine structure splitting of less than 5 µeV can be recorded, which might already be near the threshold for entangled photon emission.

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