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Kooi JW, Baselmans JJA, Hajenius M, Gao JR, Klapwijk TM, Dieleman P, et al. IF impedance and mixer gain of NbN hot electron bolometers. J. Appl. Phys.. 2007;101(4):044511.
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Risacher C, Meledin D, Belitsky V, Bergman P. First 1.3 THz observations at the APEX telescope. In: Proc. 20th Int. Symp. Space Terahertz Technol.; 2009. p. 54–61.
Abstract: The Atacama Pathfinder EXperiment (APEX) 12m telescope is operating on the Llano Chajnantor, Chile, since 2003 and a set of state of the art sub-millimeter receivers have been installed for frequencies spanning from 150 GHz to 1500 GHz. In 2008, a balanced 1.3 THz Hot Electron Bolometer (HEB) receiver was installed for the atmospheric window 1250-1380 GHz. This instrument is part of a 4-channel receiver cryostat with the other channels being 211-275 GHz, 275-370 GHz and 380-500 GHz Sideband Separating (SSB) SIS receivers. This paper presents the first observations obtained so far with the 1.3 THz band during its first months of operation. The sky measurements were taken during opportunistic commissioning and science verification phases, when the weather conditions were sufficiently good with a Precipitable Water Vapor (PWV) below 0.25 mm, which was the case only a few nights during these months. We present the first observations of the molecular transition CO J=(11-10) line on different sources such as Orion-FIR4, CW-Leo and SgrB2(M). We describe the many challenges and difficulties encountered for achieving successful THz observations from a large sub-millimeter ground-based telescope.
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Zubkova E, An P, Kovalyuk V, Korneev A, Ferrari S, Pernice W, et al. Optimization of contra-directional coupler based on silicon nitride Bragg rib waveguide. In: J. Phys.: Conf. Ser. Vol 1124.; 2018. 051048.
Abstract: We report on the development and fabrication of a contra-directional coupler based on the Bragg waveguide on Si3N4 platform. Transmitted and reflected by the contra-directional coupler spectra were measured. The reflected spectra exactly matches the one notched by the main channel of the coupler. Losses are about 3dB, coupling to the directing branch of the coupler is practically lossless. FWHM of the transmitted (reflected) spectra is 3.46 nm.
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Zubkova E, An P, Kovalyuk V, Korneev A, Goltsman G. Integrated Bragg waveguides as an efficient optical notch filter on silicon nitride platform. In: Proc. SPBOPEN.; 2017. p. 449–50.
Abstract: We modeled and fabricated integrated optical Bragg waveguides on a silicon nitride (Si3N4) platform. Transmission spectra of the integrated notch filter has been measured and attenuation at the desired wavelength of 1550 nm down to -43 dB was observed.
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Zubkova E, Golikov A, An P, Kovalyuk V, Korneev A, Ferrari S, et al. CWDM demultiplexer using anti-reflection, contra-directional couplers based on silicon nitride rib waveguide. In: J. Phys.: Conf. Ser. Vol 1410.; 2019. 012179.
Abstract: We report on the development and fabrication of a 9-channel coarse wavelength-division multiplexing for telecommunication wavelengths (1550 nm) using anti-reflection contra-directional couplers, based on silicon nitride (Si3N4) rib waveguide. The transmitted and reflected spectrum in each channel of the demultiplexer were measured. The average full width at half maximum of the transmitted (reflected) spectra is about 3 nm.
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