Traceable Measurements of CW and Pulse Terahertz Power With Terahertz Radiometer

Neuromorphic Photonics with Laser Dynamics

“…1, where two cases yielding 1 and 4 spiking events are presented. Additionally, in [6][7] we also demonstrated that a threshold in perturbation strength needs to be exceeded for the VCSEL-neuron to fire a sub-ns spiking event. These features are also observed in excitatory biological neurons.…”

“…These photonic neuronal models are capable of operating up to 9 orders of magnitude faster than the millisecond timescales of cortical neurons and which cannot be reached by approaches based on traditional microelectronic processors (see [4] and references therein). Among these, approaches for artificial photonic neurons based on compact Vertical Cavity Surface Emitting Lasers (VCSELs) have attracted considerable interest in recent years given their ultrasmall footprint, reduced costs, low energy consumption, ease to integrate in 2D arrays, potentials for high interconnectivity, and compatibility with optical communication platforms [5][6][7][8][9][10][11]. These features make VCSELs ideal candidates for their incorporation as artificial photonic neuronal models in future neuromorphic photonic networks.…”

“…1). Full details on the experimental setup and properties of the VCSELs used in this work can be found in [6][7]. The blue plots in fig.…”

Terahertz power calibration using absolute reference calorimeter

“…A second approach that utilizes a detector-based standard has the advantage of precisely measuring absolute power; therefore, several national metrology institutes around the world have focused on the development of the detector-based standard [7][8][9][10][11][12][13]. In this regard, pulse THz power measurements have also been demonstrated with the use of certain types of calibrated detectors [14,15]. The international comparison of THz power had been conducted at frequencies of 0.762 and 2.52 THz [13]; however, the measurements were verified at milliwatt levels using a high-power THz laser source.…”

Electrically-Controlled Spiking Regimes in Vertical-Cavity Surface Emitting Lasers

“…very high bandwidths, reduced cross-talk), are emerging to create new ultrafast optical neuronal models. These have been based primarily in semiconductor lasers [3][4][5][6][7][8] but also on nonlinear photonic elements such as optical modulators [9]. These photonic neuronal models are capable of operating at speeds up to 8 orders of magnitude faster than the millisecond timescales of biological neurons and which are unreachable by traditional microelectronic processors.…”