scholarly journals Thermal analysis of high-bandwidth and energy-efficient 980 nm VCSELs with optimized quantum well gain peak-to-cavity resonance wavelength offset

2017 ◽  
Vol 111 (24) ◽  
pp. 243508 ◽  
Author(s):  
Hui Li ◽  
Philip Wolf ◽  
Xiaowei Jia ◽  
James A. Lott ◽  
Dieter Bimberg
Keyword(s):  
Thermal Analysis ◽  
Quantum Well ◽  
Energy Efficient ◽  
Resonance Wavelength ◽  
Cavity Resonance ◽  
High Bandwidth ◽  
Gain Peak

Threshold dependence on the spectral alignment between the quantum-well gain peak and the cavity resonance in InGaAsP photonic crystal lasers

2003 ◽  
Vol 83 (20) ◽  
pp. 4107-4109 ◽  
Author(s):  
J. R. Cao ◽  
Wan Kuang ◽  
Sang-Jun Choi ◽  
Po-Tsung Lee ◽  
John D. O’Brien ◽  
...  
Keyword(s):  
Photonic Crystal ◽  
Quantum Well ◽  
Cavity Resonance ◽  
Spectral Alignment ◽  
Gain Peak

scholarly journals Systematic studies for improving device performance of quantum well infrared stripe photodetectors

Nanophotonics ◽  
2020 ◽  
Vol 9 (10) ◽  
pp. 3373-3384 ◽  
Author(s):  
Mel F. Hainey ◽  
Takaaki Mano ◽  
Takeshi Kasaya ◽  
Tetsuyuki Ochiai ◽  
Hirotaka Osato ◽  
...  
Keyword(s):  
Quantum Well ◽  
Incidence Angle ◽  
Blue Shift ◽  
Resonance Wavelength ◽  
Operating Conditions ◽  
Cavity Resonance ◽  
Infrared Photodetectors ◽  
Device Performance ◽  
Device Structure ◽  
Temperature Operating

AbstractThe integration of quantum well infrared photodetectors with plasmonic cavities has allowed for demonstration of sensitive photodetectors in the mid-infrared up to room-temperature operating conditions. However, clear guidelines for optimizing device structure for these detectors have not been developed. Using simple stripe cavity detectors as a model system, we clarify the fundamental factors that improve photodetector performance. By etching semiconductor material between the stripes, the cavity resonance wavelength was expected to blue-shift, and the electric field was predicted to strongly increase, resulting in higher responsivity than unetched stripe detectors. Contrary to our predictions, etched stripe detectors showed lower responsivities, indicating surface effects at the sidewalls and reduced absorption. Nevertheless, etching led to higher detectivity due to significantly reduced detector dark current. These results suggest that etched structures are the superior photodetector design, and that appropriate sidewall surface treatments could further improve device performance. Finally, through polarization and incidence angle dependence measurements of the stripe detectors, we clarify how the design of previously demonstrated wired patch antennas led to improved device performance. These results are widely applicable for cavity designs over a broad range of wavelengths within the infrared, and can serve as a roadmap for improving next-generation infrared photodetectors.

scholarly journals NanoLEDs for energy-efficient and gigahertz-speed spike-based sub-λ neuromorphic nanophotonic computing

Nanophotonics ◽  
2020 ◽  
Vol 9 (13) ◽  
pp. 4149-4162 ◽  
Author(s):  
Bruno Romeira ◽  
José M. L. Figueiredo ◽  
Julien Javaloyes
Keyword(s):  
Neural Networks ◽  
Energy Efficient ◽  
High Speed ◽  
Dynamic Properties ◽  
Optical Computing ◽  
Differential Conductance ◽  
Rate Equations ◽  
Dynamical Equations ◽  
Electrical Modulation ◽  
High Bandwidth

AbstractEvent-activated biological-inspired subwavelength (sub-λ) photonic neural networks are of key importance for future energy-efficient and high-bandwidth artificial intelligence systems. However, a miniaturized light-emitting nanosource for spike-based operation of interest for neuromorphic optical computing is still lacking. In this work, we propose and theoretically analyze a novel nanoscale nanophotonic neuron circuit. It is formed by a quantum resonant tunneling (QRT) nanostructure monolithic integrated into a sub-λ metal-cavity nanolight-emitting diode (nanoLED). The resulting optical nanosource displays a negative differential conductance which controls the all-or-nothing optical spiking response of the nanoLED. Here we demonstrate efficient activation of the spiking response via high-speed nonlinear electrical modulation of the nanoLED. A model that combines the dynamical equations of the circuit which considers the nonlinear voltage-controlled current characteristic, and rate equations that takes into account the Purcell enhancement of the spontaneous emission, is used to provide a theoretical framework to investigate the optical spiking dynamic properties of the neuromorphic nanoLED. We show inhibitory- and excitatory-like optical spikes at multi-gigahertz speeds can be achieved upon receiving exceptionally low (sub-10 mV) synaptic-like electrical activation signals, lower than biological voltages of 100 mV, and with remarkably low energy consumption, in the range of 10–100 fJ per emitted spike. Importantly, the energy per spike is roughly constant and almost independent of the incoming modulating frequency signal, which is markedly different from conventional current modulation schemes. This method of spike generation in neuromorphic nanoLED devices paves the way for sub-λ incoherent neural elements for fast and efficient asynchronous neural computation in photonic spiking neural networks.

scholarly journals Photonic crystal nanobeam cavities with lateral fins

Nanophotonics ◽  
2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Zhonghe Liu ◽  
Yudong Chen ◽  
Xiaochen Ge ◽  
Weidong Zhou
Keyword(s):  
Photonic Crystal ◽  
Energy Efficient ◽  
Small Volume ◽  
Resonance Wavelength ◽  
Carrier Injection ◽  
Alignment Position ◽  
Tunable Range ◽  
Fabrication And Characterization ◽  
Nanobeam Cavities

Abstract We present the design, fabrication, and characterization of suspended arrays of small volume, high quality factor (Q) silicon nitride photonic crystal nanobeam (PCNB) cavities with lateral nanorod fin structures. By controlling the alignment position of the fins with respect to the air holes, the resonance wavelength and Q-factor of the PCNB cavities can be tuned to realize the desired performance. Measured tunable range of 2 × 104 and 10 nm is achieved for Q-factor and resonance wavelength, respectively, with the highest Q-factor measured at 2.5 × 104. Incorporating such nanorod fins into the nanobeam cavity is demonstrated to provide improved mechanical support, thermal transport, and channels of lateral carrier injection for the suspended PCNB. The proposed PCNB cavities with lateral fins are advantageous for energy efficient, ultra-compact lasers, modulators, filters, and sensors.

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