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Advanced Digital Chips av-203 Driver

Our strategy consists of integrating multiple planar holograms on the same device and connects them with an Advanced Digital Chips av-203 circuitry Figure 1. Each DPH works in one specific spectral bandwidth, whereas the integrated circuitry includes several functionalities taper, splitter, waveguide to efficiently manipulate the light and guide it to the holograms.


This geometry overcomes the limitations of devices with one single DPH, and makes it possible to further integrate the optical chip with external optical components, like an input optical fiber and output photodetectors. In this publication, we report the design, the fabrication and Advanced Digital Chips av-203 characterization of one photonic device that integrates two DPHs with an optical circuitry, each of them being etched with a different depth in order to maximize their respective efficiency.

Holographic planar lightwave circuit for on-chip spectroscopy

Advanced Digital Chips av-203 The spectrometer chip works in two separate spectral bands — nm and — nm for a total spectral bandwidth of nm and 0. To the best of our knowledge, this is the first validation of a miniaturized spectrometer with spectral range and resolution that are comparable to conventional spectrometers. This opens a wide range of new opportunities for compact biosensors, lab-on-chip and portable medical diagnostic devices.

Figure 1 Schematic of an integrated DPH spectrometer. The spectrometer-on-chip integrates Advanced Digital Chips av-203 or multiple digital planar holograms and optical circuitry for coupling and wave-splitting operations. The light is brought to the chip with an optical fiber and coupled through a planar taper; light is guided with low losses by ridge waveguides and split based on its bandwidth by directional couplers; once directed to the hologram operating in the relative band, light is demultiplexed and focused on several different output channels at the edge of the chip.

DPH, digital planar hologram.

Full size image Materials and methods The fundamental idea behind DPH is to exploit the Advanced Digital Chips av-203 properties of elliptical Bragg gratings 31 and superimpose several elliptical gratings in a miniature supergrating. The supergrating is synthesized by performing a mathematical superposition of the refractive index modulation functions of the multiple Advanced Digital Chips av-203, which define the structure.

A x,y is an analog-generating function that describes the modulation of the effective refractive index and delineates the superposition of different interference fringes of diverging and converging light beams.

Ultra-thin chips for high-performance flexible electronics

The practical implementation of A x,y would imply that the device is fabricated with a multilevel relief and have nanometer resolution, which is impractical and time-consuming with existing lithography techniques. To overcome this complexity, the function A x,y is converted into a binary function B x,y by using a threshold algorithm to assign 1 s and Advanced Digital Chips av-203 s.

B Advanced Digital Chips av-203 is a spatial map of two-leveled features, corresponding to etched and non-etched areas in the actual fabrication. The algorithm and the device simulations are simplified by replacing curved features of the function B x,y with rectangular grooves of the same width. This operation can be regarded as a quantization of the binary function B x,y.

The binarization and quantization of A x,y are strongly nonlinear processes that introduce detrimental phenomena like interference between the hologram outputs, scattering to cladding modes or second order core reflections.

These problems are minimized by using a specifically developed design code, which dramatically reduces the incoherent scattering. More details about the simulation and design of the DPHs can be found in the Ref. One of the main properties of DPH technology is its flexibility. Just as computer logic consists of a series of 1 s and 0 s, optical transfer functions associated with any two-dimensional optical device can be generated by the combination of Advanced Digital Chips av-203 limited set of holographic symbols defining a two-dimensional diffraction grating.


In the specific case of a spectrometer, the DPH would implement a function to demultiplex the input light in the spectral domain, and reflect its components to different focal points output channels in the spatial domain. Figure 2a shows a low-magnification optical picture and a scanning electron Advanced Digital Chips av-203 image of a digital hologram. Light entering the DPHs passes through a gradual variation of the refractive index achieved by lowering the periodicity of the hologram lines on the edge Figure 2aresulting Advanced Digital Chips av-203 the elimination of spurious harmonics 30 that would otherwise be generated.

As the light goes through the hologram, it gets reflected according to its wavelength towards different output focal points channels spaced 5. Each hologram is optimized to reach high performance on one spectral band of about nm. The solution that we designed consists of an optical circuit that connects the entire device and expands its functionalities.

Light is introduced from a single mode fiber to the chip by means of a taper 33 to reduce coupling losses by matching the mode profiles Advanced Digital Chips av-203 the horizontal direction.

The input light is then split by directional couplers 3435 according to its spectral Advanced Digital Chips av-203 Figure 3 and directed through two distinct ridge waveguides RWGs to the two holograms, which are working in the separate spectral bands — nm channels and — nm channels respectively for a total bandwidth of nm and 0.

At these wavelengths, the splitting ratio Advanced Digital Chips av-203 maximum and the light is fully directed to the correspondent DPH. The dashed area in Figure 3c indicates the light that is sent to the opposite DPH, when the splitting efficiency is not maximum.

Ultra-thin chips for high-performance flexible electronics npj Flexible Electronics

Part of this light is transmitted through the hologram, the remaining part is dispersed upwards to the upper cladding, and consequently does not contribute to the output channel intensities since it is not reflected by the hologram that receives it. All of the optical elements that belong to the circuitry are optimized for the highest efficiency in the visible light range, and, unlike the DPHs, are etched through the full thickness of the waveguide Advanced Digital Chips av-203 to reach a higher confinement of the light and reduce the losses in tight turns Figure 2b.

Figure 2 DPH spectrometer fabrication details. Full Advanced Digital Chips av-203 image Figure 3 Simulation of integrated light splitter.

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