Quantum Optics Seminar by Aref Rasoulzadeh Zali

Si based Microring Resonator Photodetectors and Photonic Crystal Fano Lasers

1)     Si-based Microring Resonator Photodetectors:

Among the detectors commonly used for optical communication wavelengths, CMOS compatible Si-based photodetectors (PDs) that are suitable for 1.55-μm optical communication applications have attracted scientists’ attentions. CMOS compatibility, low cost fabrication, and integrablity with sensors and telecommunication systems are a few of outstanding features of silicide Schottky barrier detectors (S-SBDs). Photodetectors based on the internal photoemission effect over a Schottky barrier suffer from their inherent low quantum efficiencies. We proposed a photodetector (PD) based on the internal photoemission effect over a Schottky barrier on a CMOS-compatible Si microring resonator for 1.55 μm with high efficiency [1]. The proposed structure benefits from the resonant-cavity-enhanced (RCE) waveguide PDs enjoying high efficiency and wavelength selectivity [2]. The maximum value of the bandwidth-efficiency product for the proposed structure is in the order of 10 GHz, which is much higher than those reported for other RCE-based PDs.

2)     Photonic Crystal Fano Laser:

High bandwidth and ultra-compact lasers are of significant interest for the telecommunication and photonic circuits. Jesper Mork [3] demonstrated photonic crystal lasers with very high bandwidth and low power consumption. The proposed laser employs the mirror structure with Fano interference between the localized resonance of side coupled nano cavity and waveguide mode.

In many applications, information about noise performance of laser (because of photon and carrier fluctuation) is very important. In transmission communication system one needs to know about relative intensity noise (RIN) to measure signal to noise ratio or SNR. In addition, phase noise (FN) can provide invaluable insight about linewidth (because of random spontaneous emission) of the resonance. In this section, our focus will be on the numerical and analytical simulation results of recently developed model for the noise performance of Photonic crystal Fano Laser.    

[1]. Aref Rasoulzadeh Zali, et al., “Internal photoemission-based photodetector on Si microring resonator,” Opt. Lett. vol. 37, 4925 (2012).

[2]. Aref Rasoulzadeh Zali, et al., “Nonidealities and Dark Current in IR Photodetector Based on Silicide-Nanolayer Schottky Barrier Integrated Into a Si Microring Resonator,” Quantum Electronics, IEEE Journal vol. 51, pp.1-8 (2015).

 [3]. J. Mork, et al., “Photonic crystal Fano laser: Terahertz modulation and ultrashort pulse generation,” Phys. Rev. Lett., vol. 113, 163901 (2014).