ALi Fast Infrared Driver
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ALi Fast Infrared Driver
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Based on a designed plasmonic crystal and exploiting a slow-wave lattice resonance and spontaneous thermal plasmon emission, we engineer a tungsten-based thermal emitter, fabricated in an industrial ALi Fast Infrared process, and demonstrate its markedly improved practical use in a prototype non-dispersive infrared NDIR gas-sensing device. We show that the emission intensity of the thermal emitter at the CO2 absorption wavelength is enhanced almost ALi Fast Infrared compared to a standard non-plasmonic emitter, which enables a ALi Fast Infrared increase in the signal-to-noise ratio of the CO2 gas sensor.
Introduction The field of plasmonics 1 has demonstrated great potential to facilitate many sensing applications 2 such as the sensing of bio-molecules brought in contact with or in close proximity to plasmonic nano-structures through surface enhanced Raman spectroscopy 3 or resonance shifts of plasmonic nano-particles 45.
In ALi Fast Infrared local sensing schemes, Ohmic losses in the metal have been a challenge 67but nano-scale sources of plasmons 89 or light 910 are offering a remedy with improved sensitivity, as demonstrated for the detection of explosives through changes in the lasing behaviour of a lasing plasmon nanocavity NDIR spectroscopy provides excellent stability, selectivity and sensitivity 20 and is therefore the preferred gas sensing method widely used in e.
ALi Fast Infrared sensors see Fig. However, these devices are often quite bulky and suffer from high power consumption, slow transient response and aging effects.
In recent years, micro-electro-mechanical systems MEMS based miniaturized ALi Fast Infrared thermal emitters have become available 2425 Metal structures, ALi Fast Infrared contrast, are generally good absorbers of visible and infrared light. However, a flat sheet of metal such as, in particular, a tungsten heating element in a thermal emitter, is a good reflector for a broad range of frequencies rather than an absorber. The structure comprises a periodic array of metal tungsten 29 elements, added above a micro-heater and embedded in a silicon dioxide membrane see Fig.
Figure 1: The NDIR sensing system with a plasmonic crystal slow-wave thermal emitter. Light emitted from the source is collimated by a parabolic mirror, sent through a ALi Fast Infrared cell, filtered, refocused and finally detected. In the bare device, some of the incoming light is absorbed when it traverses the dielectric, while in the plasmonic crystal device the light is trapped in a plasmonic mode and the plasmons are subsequently absorbed in the electron gas, schematically represented by a scattering process between ALi Fast Infrared surface plasmon with wave-vector q and an electron with wave-vector k.
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Plasmons are spontaneously generated in the heated metal surface the inverse process to the absorption event but they ALi Fast Infrared to the external light-field only in the presence of a plasmonic crystal structure. Full size image As basic design for the plasmonic crystal emitter structure we employ a periodic hexagonal arrangement of tungsten W cylinders as shown schematically in Fig. This enables a coupling between light and surface plasmons SPs and these surface plasmons experience absorption due to collision processes with electrons and phonons Fig.
ALi Fast Infrared
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Because of the fundamental reciprocity of quantum electrodynamics, the process of spontaneous generation of plasmons is also possible and in thermodynamic equilibrium the emission and absorption of SPs is balanced. In the plasmonic crystal thermal emitter realised here, the SPs are spontaneously emitted on the ALi Fast Infrared surfaces and, most importantly, out-coupled efficiently to the external light field compare: The frequency and angle dependence of the absorption strength of the plasmonic structure determines the frequency and angle dependence of the emitted IR light from the heated device.
For NDIR gas sensing, it is advantageous to use an IR source which ALi Fast Infrared an efficient emitter at the gas absorption wavelength of interest.
Broadband IR sources such as filament bulbs generate significant ALi Fast Infrared of heat and ALi Fast Infrared of band radiation which has to be heavily attenuated through the use of an optical band pass filter in order to make the NDIR system selective to the target gas. In our approach, we therefore aim to achieve a very efficient and narrowband thermal emitter to enhance emission at the CO2 absorption wavelength of 4.
Tuning of the SP resonance was achieved by varying two main design parameters in the metal surface layer: Figure 2b presents a map of the calculated emissivity in normal direction at 4. This provides us with guidance towards the optimal structure for emissivity enhancement at the targeted CO2 wavelength. We ALi Fast Infrared identify two distinct modes that incoming light can couple into.
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ALi Fast Infrared The mode at higher pitch values around ALi Fast Infrared. The other mode seen in the emissivity map is the surface lattice resonance SLRwhich arises from coupling between individual particle resonances 32 Incoming light can couple efficiently to both modes and thereby be absorbed almost completely, which manifests itself in emissivity values very close to unity at resonance for both the GPM and SLR.
The difference, however, lies in their spatial profile. In the case of the GPM the light is confined to the two metal surfaces below and above the silica region whereas at the SLR, the ALi Fast Infrared is trapped close to the cylinders on the surface compare: Figure 2: Structure-dependent emissivity.