M.-C. Amann’s research while affiliated with Technical University of Munich and other places

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Publications (309)


Giant nonlinear circular dichroism from nonlinear chiral polaritonic metasurfaces
  • Conference Paper

January 2020

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15 Reads

D. Kim

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J. Yu

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We report giant nonlinear circular dichroism for second- and third-harmonic generation from nonlinear chiral polaritonic metasurfaces. Experimentally, over 86% of circular dichroisms for the two harmonic generations on one-chip system around 10 pm were achieved.





Non-destructive Photo-modulated Reflectance Study of GalnAsSb- based VCSEL
  • Conference Paper
  • Full-text available

January 2018

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118 Reads

Temperature dependent photoreflectance on 2.3pm GalnAsSb -based vertical cavity surface emitting laser (VCSEL) structures were performed and show that the room temperature quantum well-cavity mode energy offset is 21meV; thermally-tuning into resonance at 220±2K.

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Figure 2. (a) Tap coefficient optimization and captured eye-diagrams with FFE and without FFE (b) real-time BER curves for B2B, 500m, 1km and 2km SSMF at 100 Gb/s
Figure 3. (a) Experimental setup of the VCSEL link (b) measured frequency response and BER (c) comparison of real-time short-reach optical links with custom front-end transceiver ICs
Towards efficient 100 Gb/s serial rate optical interconnects: A duobinary way

June 2017

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167 Reads

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5 Citations



Single Stack Active Region Nonlinear Quantum Cascade Lasers for Improved THz Emission

May 2017

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12 Reads

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1 Citation

IEEE Photonics Journal

We present a single stack active region design for terahertz emission by difference frequency generation in quantum cascade lasers. The active region contains a single design, which is based on multiple optical transitions within one period. This results in both a giant nonlinearity and an ultra-broad optical gain. The provided optical gain spectrum is broad enough to support two distinct mid-infrared modes with a significant spectral separation. For dual-emission, the waveguide contains a buried, index-coupled distributed feedback grating. This grating is based on a sampled approach to provide selective feedback for two mid-infrared modes at λ1\lambda_1 = 8.39 μ\mu m and λ2\lambda_2 = 9.38 μ\mu m. Simultaneously, the manifold of possible transitions within the active region is designed to provide a peak nonlinear susceptibility of | χ(2)\chi^{(2)} | = 29 nmV 1^{-1} at the conversion to 3.8 THz. The device emits up to 210 μ\mu W THz power at room temperature with a nonlinear conversion efficiency of η\eta = 2.05 mWW 2^{-2} .


Citations (59)


... Extending the wavelength range to longer wavelengths presents significant challenges. As the wavelength increases, Auger recombination considerably reduces lasing efficiency [53], [54]. To extend the wavelength range into the mid-infrared above 3 µm, alternative material systems such as PbSe or PbTe [4], or different QW configurations such as type-II configurations, could be considered [55]. ...

Reference:

Optically pumped GaSb-based thin-disk laser design considerations for cw and dual-comb operation at a center wavelength around 2 μm
Auger recombination in type I GalnAsSb/GaSb lasers and its variation with wavelength in the 2–3 μm range

... The measured frequency response showed that the link BW is limited by the VCSEL and the real-time BER with PRBS7 at 80 Gb/s was below 7% HD-FEC threshold. This is the highest data rate demonstrated in real-time for a SM LW-VCSEL without complex offline DSP [29]. ...

Towards efficient 100 Gb/s serial rate optical interconnects: A duobinary way

... [7][8][9][10] As an alternative to traditional THz QCLs, [7][8][9][10] THz sources based on intra-cavity difference-frequency generation (DFG) in mid-infrared (mid-IR, frequencies from 10 to 100 THz) QCLs have been developed and currently represent the only monolithic, electrically pumped semiconductor laser source technology able to generate coherent radiation in the 0.4-6 THz band at room temperature. [11][12][13][14] THz DFG-QCLs use an active region designed for broad mid-IR gain [15][16][17] to permit simultaneous lasing in two mid-IR modes, which are spaced by the desired THz frequency. The device's active region is also designed to possess a strong second-order nonlinear response χ (2) for THz DFG. ...

Single Stack Active Region Nonlinear Quantum Cascade Lasers for Improved THz Emission

IEEE Photonics Journal

... 18 There are also few studies focusing on the transient thermal effects in semiconductor lasers. 19,20 Size scalability of micro-and nanocavity lasers is another important consideration as wavelength-and sub-wavelength scale lasers have been pursued to realize smaller footprints, lower lasing thresholds, and higher modulation speeds, giving rise to non-classical phenomena which are hardly seen in conventional resonators, such as the Purcell effect (enhancement of the spontaneous emission rate) and high β-factor (spontaneous emission coupling to the lasing mode). 21−23 Furthermore, size scaling leads to an increased effect of thermal interfaces that needs to be taken into account. ...

Transient thermal analysis of semiconductor diode lasers under pulsed operation

... Vertical-cavity surface-emitting lasers (VCSELs) have become technologically mature and highly sophisticated optoelectronic emitters. They are nowadays one of the most important semiconductor lasers, dominating the high-speed datacom [1] and sensing markets [2]. Among others, quantum optic applications, such as atomic clocks [3] and quantum gyroscopes [4], represent a hot topic. ...

Room-temperature vertical-cavity surface-emitting lasers at 4 μ m with GaSb-based type-II quantum wells
  • Citing Article
  • February 2017

... Compared with the first two types of vdWHs, type-III heterostructures are relative rare. Due to the unique band alignment, the electrons in the type-III vdWHs are prone to transfer from the valence band (VB) of one 2D material to the conduction band (CB) of another, which is desirable for improving the electron tunneling efficiency in TFETs through band-to-band tunneling transport mechanism [79][80][81][82]. ...

Highly strained Esaki tunnel diodes on InP substrate with type-III band alignment
  • Citing Article
  • December 2016

... For the pristine VCSEL device, increasing the forward current will increase the peak wavelength at which the laser emits most of its power. 37 The output power of a VCSEL is proportional to the current density in the active region. This is because the current density determines the number of carriers that are injected into the active region. ...

Temperature stable mid-infrared GaInAsSb/GaSb Vertical Cavity Surface Emitting Lasers (VCSELs)

... 28-31, involves the use of an air gap within the DBR to attain a significant contrast in the refractive index of the DBR layers. Alternatively, another strategy to address this challenge is the exploration of more intricate compound materials [32,33]. ...

Continuous wave vertical cavity surface emitting lasers at 2.5 μm with InP-based type-II quantum wells
  • Citing Article
  • April 2015

... We observed a spectral distinguishability of the four off-the-shelf VCSELs due to fabrication imperfections, however, for our proof-of-principle demonstration we accept this open side channel. When commercializing such systems in the future, this could be avoided, e.g., by proper selection of the diodes prior to the assembly of the module [39], by the use of microelectromechanical system (MEMS)-tunable structures [41,42] or by spectral filtering once the spectra of the four diodes start overlapping. ...

Temperature characteristics of surface micromachined MEMS-VCSEL with large tuning range

... These conventional fire detection methods can achieve acceptable FNR, but are susceptible to non-fire interference sources resulting in high FPR. For example, water vapor, dust and even insects can cause smoke detectors to trigger false alarms [4]. Frequent alarms caused by fire misinformation will waste a lot of social resources and erode people's sense of urgency and crisis. ...

Performance of a fire detector based on a compact laser spectroscopic carbon monoxide sensor