Igor Vurgaftman

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We present the design of mid-infrared and THz quantum cascade laser cavities formed from planar photonic crystals with a complete in-plane photonic bandgap. The design is based on a honeycomb lattice, and achieves a full in-plane photonic gap for transverse-magnetic polarized light while preserving a connected pattern for efficient electrical injection.(More)
The in-plane and cross-plane thermal conductivities of the cladding layers and active quantum wells of interband cascade lasers and type-II superlattice infrared detector are measured by the 2-wire 3ω method. The layers investigated include InAs/AlSb superlattice cladding layers, InAs/GaInSb/InAs/AlSb W-active quantum wells, an InAs/GaSb su-perlattice(More)
The mid-infrared (mid-IR, 2.5 to 10 μm wavelengths) is a strategically important spectral band for an array of applications such as thermal imaging, chem/bio sensing, spectroscopy, infrared countermeasures, and free space communications. Mid-IR photonics have emerged as an active area of investigation in recent years, largely spurred by the rapid progress(More)
Using picosecond pulses from a free-electron laser, we have carried out a pump-probe determination of Shockley-Read-Hall ͑SRH͒ and Auger free-carrier recombination lifetimes in two long-wave ͑6–7 ␮m͒ W-structure laser with InAs/Ga 1Ϫx In x Sb/InAs/AlSb active regions. The SRH coefficient is nearly constant (AϷ4.0ϫ10 8 s Ϫ1), while the Auger coefficient has(More)
Silicon integration of mid-infrared (MIR) photonic devices promises to enable low-cost, compact sensing and detection capabilities that are compatible with existing silicon photonic and silicon electronic technologies. Heterogeneous integration by bonding III-V wafers to silicon waveguides has been employed previously to build integrated diode lasers for(More)
A volume Bragg grating recorded in photo-thermo-refractive glass was used to spectrally lock the emission from an 18-μm-wide interband cascade laser ridge to a wavelength of 3.12 μm. The spectral width of emission into the resonant mode is narrowed by more than 300 times, and the thermal wavelength shift is reduced by 60 times. While the power loss penalty(More)
A design and results for an instrument with a quantum cascade laser and an antimonide diode laser to measure simultaneously and with high precision seven isotopologues of carbon dioxide and water vapor. Methods and results for determining the effects that limit absorption noise at the level of 5x10 −6 are presented and discussed. New frontiers in quantum(More)
Articles you may be interested in Type-I interband cascade lasers near 3.2μm Thermally activated leakage current in high-performance short-wavelength quantum cascade lasers Microprobe photoluminescence assessment of the wall-plug efficiency in interband cascade lasers Influence of InAs, AlAs δ layers on the optical, electronic, and thermal characteristics(More)
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