Microfluidic tuning of distributed feedback quantum cascade lasers

Université de Neuchâtel, Neuenburg, Neuchâtel, Switzerland
Optics Express (Impact Factor: 3.49). 12/2006; 14(24):11660-7. DOI: 10.1364/OE.14.011660
Source: PubMed

ABSTRACT In this Letter, we report the tuning of the emission wavelength of a single mode distributed feedback quantum cascade laser by modifying the mode effective refractive index using fluids. A fabrication procedure to encapsulate the devices in polymers for microfluidic delivery is also presented. The integration of microfluidics with semiconductor laser (optofluidics) is promising for new compact and portable lab-on-a-chip applications.

12 Reads
  • Source
    • "Therefore much effort has been put into developing advanced on-chip sensing concepts, to enhance the light matter interaction for possible on-chip sensing applications [19]. This can be realized by using cavity-enhanced absorption spectroscopy [20],photonic crystal cavities [21], intra-cavity absorption spectroscopy [22], by detecting a refractive index change [23,24] or by using plasmonic resonances [25]. For on-chip sensing of fluids, things become much easier, since liquid phase absorption is much higher than in gas phase, while at the same time the absorption features are broadened and therefore do not require a high spectral resolution. "
    [Show abstract] [Hide abstract]
    ABSTRACT: We demonstrate the monolithic integration of a mid-infrared laser and detector utilizing a bi-functional quantum cascade active region. When biased, this active region provides optical gain, while it can be used as a detector at zero bias. With our novel approach we can measure the light intensity of the laser on the same chip without the need of external lenses or detectors. Based on a bound-to-continuum design, the bi-functional active region has an inherent broad electro-luminescence spectrum of 200 cm-1, which indicates its use for single mode laser arrays. We have measured a peak signal of 191.5 mV at the on-chip detector, without any amplification. The room-temperature pulsed emission with an averaged power consumption of 4 mW and the high-speed detection makes these devices ideal for low-power sensors. The combination of the on-chip detection functionality, the broad emission spectrum and the low average power consumption indicates the potential of our bi-functional quantum cascade structures to build a mid-infrared lab-on-a-chip based on quantum cascade laser technology.
    Sensors 02/2013; 13(2):2196-205. DOI:10.3390/s130202196 · 2.25 Impact Factor
  • Source
    • "While a large liquid-light interaction and high Q-factors are both required for improving the sensitivity and the detection limit of the sensor, there is generally a trade-off between these two parameters [43]. The cavity Q-factor tends to decrease after the infiltration step due to the reduction of the PhC index contrast [3] [5] [41] [44]. Additionally, the liquid may not be lossless, thereby degrading the Qfactor and hence the enhancement generated by the cavity for sensing performance [43]. "
    [Show abstract] [Hide abstract]
    ABSTRACT: We report reconfigurable optofluidic photonic crystal components in silicon-based membranes by controllably infiltrating and removing fluid from holes of the photonic crystal lattice. Systematic characterizations of our fluidically defined microcavities are presented, corresponding with the capability to increase or decrease the span of the fluid-filled regions and thus alter their optical properties. We show initial images of single-pore fluid infiltration for holes of diameter 265 nm. Furthermore, the infiltration process may employ a large range of optical fluids, adding more flexibility to engineer device functionality. We discuss the great potential offered by this optofluidic scheme for integrated optofluidic circuits, sensing, fluorescence and plasmonic applications.
    Proceedings of SPIE - The International Society for Optical Engineering 02/2009; DOI:10.1117/12.811083 · 0.20 Impact Factor
  • Source
    [Show abstract] [Hide abstract]
    ABSTRACT: Using a home-made seed at 1053 nm from a Yb(3+)-doped passively mode-locked fiber laser of 1.5 nJ/pulse, 362 ps pulse duration with a repetition rate of 3.842 MHz, a compact, low cost, stable and excellent beam quality non-collinear chirped pulse optical parametric amplifier omitting the bulky pulse stretcher has been demonstrated. A gain higher than 4.0 x 10(6), single pulse energy exceeding 6 mJ with fluctuations less than 2% rms, 14 nm amplified signal spectrum and recompressed pulse duration of 525 fs are achieved. This provides a novel and simple amplification scheme.
    Optics Express 05/2007; 15(8):4493-8. DOI:10.1364/OE.15.004493 · 3.49 Impact Factor
Show more