We round out our capabilities by maintaining close relations with a number of key strategic industrial and university partners. We are committed to maintaining a leadership position in photonic detection technology, and to continuous investment in advanced product research and development.

Voxtel Optoelectronics

At Voxtel's Optoelectronics Division, sophisticated detectors and electro-optical imaging systems are developed and manufactured for system integrators and OEM customers. We service the value chain with truly transformative near-infrared laser radar (LADAR) receivers, and highly sensitive APDs and APD receivers for fiber and free-space telecommunications, as well as photon counting devices. These APDs have higher gain and lower noise than any other available NIR APD, allowing receivers with better than –44 dBm noise equivalent power (NEP) and superior bit error rate (BER) performance over the entire frequency range. These APDs are manufactured, packaged in rugged hermetic housings, integrated with thermoelectric coolers (TECs), integrated with fiber optics and other optics, coupled with lasers, and integrated with sophisticated electronics and image processing to provide our customers with superior value.

 Avalanche Photodiodes and Carrier Multiplication Devices

Voxtel offers InGaAs avalanche photodiodes (APDs), InGaAs single carrier multiplication APDs (SCM-APDs), and silicon photomultiplier arrays (SiPMs). Voxtel's low-noise, highly responsive InGaAs and Si detectors are available in a variety of package formats, including TE-cooled TO-8 packages, uncooled TO packages, and bare die. Photon Counting Devices and Instruments

Voxtel's single photon counting (SPC) and time-of-arrival (TOA) Instruments are ideal for various applications — from single photon counting to LADAR and LIDAR ranging and time-correlated single photon counting (TCSPC).

LADAR and Active Imaging Systems

Voxtel manufactures LADAR receivers using scanned single-element APDs, where the low noise and high gain of Voxtel's SCM-APD devices permits higher scan rates and longer standoff ranges.

 Receivers based on Voxtel's two-dimensional APD arrays include highly uniform detector arrays, elements with high responsivity in the 900 to 1700 nm spectral range, read-out integrated circuits (ROICs) designed in-house, and hermetic thermoelectric packages. Our ‘whole-product' systems experience reduces resource commitment during technology transfer, and will have significant rewards over the product lifetime.

We specialize in "green," less toxic nanocrystals and materials difficult to manufacture using conventional techniques, allowing developers to go to market with products free from cadmium, lead, and other toxic materials found in common nanocrystals.

Voxtel's high-volume fluidic and gas flow synthesis and continuous feedback control also ensures multi-kg quantities, as well as high quantum yield (QY), precise spectral response, and well defined HOMO and LUMO levels — free of defects.

Voxtel's series of environmentally friendly, covert, optically transparent Voxdot nanotaggants are composed of environmentally benign nanocrystal quantum dots, and functionalized with luminophores that have well-defined visible (VIS), near-infrared (NIR) and/or short-wavelength infrared (SWIR) emission spectra. These emission spectra are optimized for covert or semi-overt/covert operation, visible with one or more detectors, including silicon CCDs, night vision goggles (NVGs), and/or SWIR InGaAs cameras at standoff ranges exceeding 2.5 km!

The nanocrystal taggants are deployable in solvents, inks/paints, and aerosols, allowing them to be easily integrated into various applications; (1) Combat Identification (CID); (2) Material Control and Tracking (MCT); (3) Identification of Friend or Foe (IFF); (4) Tag, Track, and Locate (TTL), and other unique operations needs.

Upon interrogation with a laser, the Voxdot nanotaggants emit at one or more wavelength(s), each of which can be programmed with different intensity in multiple bands in the VIS–SWIR range, allowing coded binary taggants to be deployed from handheld, airborne, or even space-based platforms. Detection ranges exceeding 2.5 km have been demonstrated against a variety of backgrounds — cement, fabric, paint, wood, etc.

Voxtel's low-cost methods of manufacturing Voxdots allow multi-kg quantities of high-quality nanocrystals to be delivered at very reasonable prices. Our corporate experience ranges from military electro-optical systems engineering to detector development and nanophotonics, a rare and broad combination of skills. Our experience allows us to work with our customers to develop concepts of operation, and to identify spectral bands and atmospheric windows for optimal deployment of the Voxdot nanotaggants.

Voxtel has two classes of Voxdot nanotaggants: transparent and pigmented. Each class can be used separately or together.

Transparent Nanotaggants:

The transparent Voxdot nanotaggants are optically clear and, upon UV stimulation, emit in the VIS–NIR–SWIR. These taggants are stimulated in the ‘solar blind' portion of the UV spectrum (the UVSB), so they do not emit upon solar exposure. The taggants can be specified to respond to UVA–UVC (below 400 nm), UVB–UVC (below 315 nm), or only UVC (below 266 nm) laser radiation.

The UVC laser wavelengths have the benefit of being more eye-safe than visible and NIR lasers, including most commonly used laser designators and NIR laser rangefinders. This allows power density 4 orders of magnitude higher to be used, though it requires UV laser sources.

Pigmented Nanotaggants:

Voxtel's pigmented nanotaggants are not optically transparent, but can be activated by laser radiation or other light sources in the UV, VIS, or NIR portions of the optical spectrum. These nanotaggants can also be tuned to emit in 50 nm wavebands anywhere in the VIS–SWIR spectral region.

Voxtag™ Nanocrystal Security Inks and Anti-Counterfeiting Tags

Voxtel has developed a series of nanocrystal security inks that can be incorporated directly into a clear laminate, plastic, or appliqué. These nanocrystal security inks can also be incorporated into a variety of dye-based and pigment-based inks for use in banknotes, concert tickets, lottery tickets, or CDs — even in varnishes and lacquer finishes.

To withstand an expanding, knowledgeable criminal fraternity, and to counter increasingly sophisticated forgery and counterfeiting, Voxtel has developed security inks with multi-tiered levels of security. Our unique experience in security inks, detectors, and electro-optical scanners, allows us to provide our customers with complete end-to-end solutions in one house — ensuring security.

Nanophotonics & Electrooptical Products

Photovoltaics

Voxtel is rapidly emerging as the world's leading developer of next-generation photovoltaic products for collecting energy from the sun. Voxtel's nanocrystal-sensitized thin-film photovoltaic products are unique with respect to providing lightweight sources of renewable power for versatile and inexpensive use, efficient over the range of geographical, seasonal, atmospheric, and solar conditions.

Our photovoltaic offering addresses the limitations of existing photovoltaics, most of which do not absorb efficiently, and few of which perform well globally as a function of regional climate conditions (especially cloud cover), air pollution, and time of day. All existing commercial PVs have non-ideal spectral response, with bandgap energies that are not optimal for single or multiple-junction PVs. These PV technologies are limited by their single bulk semiconductors, which are locked to that semiconductor's intrinsic bandgap – as well as by bandgap fluctuation with temperature and other static design features. By using an NC absorber, Voxtel is able to reduce or eliminate many of these rigid factors, manufacturing chemically stable NCs with the desired bandgap(s).

LEDs

Our environmentally friendly nanophosphors provide the ability to tune LEDs to emit at almost any color from the ultraviolet to the infrared. Through-hole and SMD LEDs are available with a wide range of color options.

Polymer -OLEDS

Today, Voxtel is in the early stages of commercializing its IP package and related print-based P-OLED solution. Voxtel is building partnerships with leading display manufacturers to scale up the manufacturing to high production volume. Our solutions offer higher brightness, better color fidelity, lower material and manufacturing costs, and increased lifetime over existing display and solid-state lighting solutions.