Band pass filters in the 1μm spectral region: Thick metal screens

Lüker, A.; Hein, H.; Schulz, Joachim; Dambrowsky, Nina; Sternberg, Oren; Sweetgall, M.J.; Abdijalilov, K.; Möller, K. D.; Grebel, Haim

doi:10.1016/j.infrared.2007.07.007

Cited by 7 publications

(6 citation statements)

References 14 publications

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“…The radiation power density at T = 300 K may reach 46 mW/cm 2 ; when the window area is 5 cm 2 , the com- plete power through the window may be 220 mW. A HELIOX standard cryostat from the Oxford Instruments Co. with 3 He vapor pumping has a cooling power of ~100 µW at 300 mK so that the attenuation of the background radiation should be no less than 33 dB, reached by placing three grid filters. A TRITON dilution cryostat from the same company with a cooling power of 20 µW per 100 mK requires that four filters be already installed.…”

Section: Electronics and Radio Engineeringmentioning

confidence: 99%

“…To prevent the overheating of cryogenic receiving devices from external thermal radiation, it is necessary to use cooled band-pass filters. In cryostats with pumped-out 3 He vapors and a temperature of 300 mK, the background infrared (IR) room-temperature radiation should be attenuated by more than three orders of magnitude, and in dilution cryostats with a base temperature of ~30 mK, by more than four orders of magnitude. It is impossible to achieve this attenuation with one filter.…”

Section: Introductionmentioning

confidence: 99%

“…The application area of these filters has been lately expanded to the IR and visible spectrum regions in a hundreds-of-terahertz frequency band [3]. This expansion is largely related to the replacement of the technology.…”

Section: Introductionmentioning

confidence: 99%

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Fabrication and characteristics of mesh band-pass filters

et al. 2009

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Grid band-pass filters for 300-, 450-, 600-, and 750-GHz central frequencies are designed and manufactured. Copper and aluminum foil and foil-clad fluoroplastic filters were made by chemical and ionic etching methods, and an aluminum film sputtered on a kapton film was formed by the lift-off lithography method. A gold layer was electrolytically applied on copper grid filters. Characteristics of the filters were measured in the millimeter, submillimeter, and infrared (IR) ranges. Foil filters demonstrate better characteristics at lower frequencies, while filters with sputtered films have better characteristics at upper frequencies. The smallest transmission loss was 0.13 dB. For a stage consisting of four filters, this loss was 0.9 dB. The IR radiation attenuation in a 2.5-to 25-µ m wavelength region was no less than 11 dB per filter.

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Section: Electronics and Radio Engineeringmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Fabrication and characteristics of mesh band-pass filters

et al. 2009

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“…Both metal screens are separated by a dielectric layer, which is embedded with dielectric colloids. Suspended monolayer or multilayers of individual screens have been used as electromagnetic bandpass filters in the mid- to far-infrared (IR) [1,2,3,4] and in the visible and near-IR [5,6,7], albeit without the separating colloidal layer. They are typically employed in the long wavelength regime where the screen’s pitch is smaller than the incident wavelength.…”

Section: Introductionmentioning

confidence: 99%

Periodic Metallo-Dielectric Structures: Electromagnetic Absorption and its Related Developed Temperatures

et al. 2019

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Multi-layer, metallo-dielectric structures (screens) have long been employed as electromagnetic band filters, either in transmission or in reflection modes. Here we study the radiation energy not transmitted or reflected by these structures (trapped radiation, which is denoted—absorption). The trapped radiation leads to hot surfaces. In these bi-layer screens, the top (front) screen is made of metallic hole-array and the bottom (back) screen is made of metallic disk-array. The gap between them is filled with an array of dielectric spheres. The spheres are embedded in a dielectric host material, which is made of either a heat-insulating (air, polyimide) or heat-conducting (MgO) layer. Electromagnetic intensity trapping of 97% is obtained when a 0.15 micron gap is filled with MgO and Si spheres, which are treated as pure dielectrics (namely, with no added absorption loss). Envisioned applications are anti-fogging surfaces, electromagnetic shields, and energy harvesting structures.

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“…MIM has the inherent ability to guide light in photonic circuits beyond diffraction limit [5][6].While for insulator-metal-insulator (IMI) structures, surface plasmons offers poor confinement in deep subwavelength scale but are able to propagate over large distances [5]. Several devices based on MIM waveguides such as optical tunable filters [7], optical buffers [8][9], bends, splitters and couplers [10] and Mach-Zender interferometer [11] are theoretically and experimentally demonstrated. But day now surface Plasmon resonance (SPR) is receiving a considerable attention in the area of chemical and biochemical sensors.…”

Section: Introductionmentioning

confidence: 99%

Ultra-high sensitive plasmonic refractive index sensor based on ring resonator

Zafar

Sethia

Mathur

et al. 2015

2015 International Conference on Electrical, Electronics, Signals, Communication and Optimization (EESCO)

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In this paper, an ultra compact surface Plasmon (SP) sensor based on 'ring resonator coupled metal-insulator-metal (MIM) waveguide' is theoretically studied and numerically simulated by finite difference time domain (FDTD) method. Ring and waveguide is filled by material to be sensed and implanted in a silver medium whose frequency dependent relative permittivity is characterized by Drude model. Any change in refractive index of material to be sensed leads to variation in resonance condition. Refractive index of the medium can be sensed by detecting resonant wavelength of the ring resonator. Due to the confinement of material to be sensed and optical energy to same area, light-matter interaction increases, and hence, an ultra high value of sensitivity(S= 1235 nm per refractive index unit) is obtained. Sensitivity can be further increased with increasing radius of resonator but at the cost of increased propagation losses and size of the device. Device offers an ultra large value of sensitivity that opens its opportunity to be used in biological and biochemical sensors.

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Band pass filters in the 1μm spectral region: Thick metal screens

Cited by 7 publications

References 14 publications

Fabrication and characteristics of mesh band-pass filters

Fabrication and characteristics of mesh band-pass filters

Periodic Metallo-Dielectric Structures: Electromagnetic Absorption and its Related Developed Temperatures

Ultra-high sensitive plasmonic refractive index sensor based on ring resonator

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