Gb/s visible light communications with colloidal quantum dot color converters

This paper reports the utilization of colloidal semiconductor quantum dots as color converters for Gb/s visible light communications. We briefly review the design and properties of colloidal quantum dots and discuss them in the context of fast color conversion of InGaN light sources, in particular in view of the effects of self-absorption. This is followed by a description of a CQD/polymer composite format of color converters. We show samples of such color-converting composite emitting at green, yellow/orange and red wavelengths, and combine these with a blueemitting microsize LED to form hybrid sources for wireless visible light communication links. In this way data rates up to 1 Gb/s over distances of a few tens of centimeters have been demonstrated. Finally, we broaden the discussion by considering the possibility for wavelength division multiplexing as well as the use of alternative colloidal semiconductor nanocrystals

Organic semiconductor laser platform for the detection of DNA by AgNP plasmonic enhancement

Organic semiconductor lasers are a sensitive biosensing platform that respond to specific biomolecule binding events. So far, such biosensors have utilized protein-based interactions for surface functionalization but a nucleic acid–based strategy would considerably widen their utility as a general biodiagnostic platform. This manuscript reports two important advances for DNA-based sensing using an organic semiconductor (OS) distributed feedback (DFB) laser. First, the immobilization of alkyne-tagged 12/18-mer oligodeoxyribonucleotide (ODN) probes by Cu-catalyzed azide alkyne cycloaddition (CuAAC) or “click-chemistry” onto an 80 nm thick OS laser film modified with an azide-presenting polyelectrolyte monolayer is presented. Second, sequence-selective binding to these immobilized probes with complementary ODN-functionalized silver nanoparticles, is detected. As binding occurs, the nanoparticles increase the optical losses of the laser mode through plasmonic scattering and absorption, and this causes a rise in the threshold pump energy required for laser action that is proportional to the analyte concentration. By monitoring this threshold, detection of the complementary ODN target down to 11.5 pM is achieved. This complementary binding on the laser surface is independently confirmed through surface-enhanced Raman spectroscopy (SERS)

MQW nanomembrane assemblies for visible light communications

We report color-conversion of InGaN LEDs and lasers using an AlInGaP multi-quantum-well nanomembrane. In particular, we demonstrate free-space OOK data transmission at 180 Mb/s from a laser diode blue-to-red converted by a heterogeneous nanomembrane/sapphire lens assembly

Colloidal Quantum Dot Color Converters for Visible Light Communications

The properties and performance of CdSSe/ZnS colloidal quantum dot composite materials for use as InGaN LED color converters in visible light communications applications is reported. 500Mb/s optical wireless transmission is demonstrated

Colloidal quantum dot and epitaxial quantum-well platelet colour-converters for visible light communication

No abstract available

Index and gain dynamics of optically-pumped GaInNAs vertical-cavity semiconductor optical amplifiers

To study the dynamic effects in GaInNAs vertical-cavity semiconductor amplifiers (VCSOAs), we carried out a pump-probe experiment on an optically biased VCSOA, first at antiresonance and then in gain. At antiresonance, the highest absorption region of the amplifier, the carrier-population-depletion-induced shift in the wavelength of the absorption was measured as a function of pump-probe delay. The corresponding index recovery time was measured to be ~50 ps±5 ps. In the amplification regime, we observed that the carrier depletion induced by the pump pulse decreased the available gain. The recovery time for the device gain in dB under these conditions was measured at ~55±15 ps. These results indicate that GaInNAs VCSOAs can process data at 10 Gbits/s with no patterning effect

Slow-light in a 1300nm GaInNAs vertical-cavity semiconductor optical amplifier

Presents experimental and theoretical investigations of slow light phenomenon in a 1300 nm GaInNAs vertical-cavity semiconductor optical amplifier. Demonstration of tunable group delays between 25 and 100 ps by gain change and their analysis are reporte

Tunable fiber-VCSEL with an intracavity polymer microlens

We report a tunable, single-mode fiber-VCSEL possessing a polymer microlens integrated on its gain region surface. 1.03-¿m CW operation with a 13-nm free-spectral-range-limited tuning, a 6-mW threshold and fiber-coupled output power of 10mW is demonstrated

1550nm pulsed operation of a GaInNAsSb VCSEL

Long-wavelength vertical-cavity surface-emitting lasers (VCSELs) with high-speed modulation are required as light source for the next generation metropolitan area network (MAN) and local area network (LAN). W A S is the most promising material for this device. We have proposed GalnNAsSb QW that includes small amount of Sb to improve the crystalline quality of GaInNAs by GSmEgmwfJ[~I], and introduced GaNAs barriers [2] to compensate the strain of GaInNAsSb layers

Thermal management, structure design and integration considerations for vecsels

In this chapter we introduce the design criteria structural and optical characteristics, cavity format and laser performance considerations for VECSEL