Browsing by Author "Prabhu, S.S."
Now showing 1 - 5 of 5
- Results Per Page
- Sort Options
Item Indium Antimonide (InSb) based planar terahertz plasmonic waveguide(2014) Ranjana, J.S.; Bhatt, P.; Surdi, H.; Sangala, B.R.; Satyanarayan, M.N.; Umesh, G.; Prabhu, S.S.We demonstrate experimental and theoretical studies on the transmission characteristics of Terahertz (THz) Semiconductor-Insulator-Semiconductor (SIS) Planar Plasmonic waveguide made up of Indium Antimonide (InSb). We report tunability of the waveguide characteristics by changing the device geometrical dimensions. The results are of critical importance for optimizing and determining the resonance characteristics of the device. � 2014 IEEE.Item Indium Antimonide (InSb) based planar terahertz plasmonic waveguide(IEEE Computer Society, 2014) Ranjana, J.S.; Bhatt, P.; Surdi, H.; Sangala, B.R.; Satyanarayan, M.N.; Umesh, G.; Prabhu, S.S.We demonstrate experimental and theoretical studies on the transmission characteristics of Terahertz (THz) Semiconductor-Insulator-Semiconductor (SIS) Planar Plasmonic waveguide made up of Indium Antimonide (InSb). We report tunability of the waveguide characteristics by changing the device geometrical dimensions. The results are of critical importance for optimizing and determining the resonance characteristics of the device. © 2014 IEEE.Item Indium antimonide (InSb) waveguide based THz sensor(2015) Ranjana, J.S.; Bhatt, P.; Deshmukh, P.; Sangala, B.R.; Satyanarayan, M.N.; Umesh, G.; Prabhu, S.S.We demonstrate the sensing capability of InSb based planar THz waveguide with stubs, which can sense biomolecules of a few micro liter quantity in de-ionized (DI) water. We chose Bovine Serum Albumin (BSA), a well-known standard protein molecule to investigate the sensing property. The calculated absorption coefficient from the Fourier transformed transmission characteristics show prominent changes with different concentrations of BSA, demonstrating the potential application of the device to function as a simple THz sensor. � 2015 IEEE.Item Indium antimonide (InSb) waveguide based THz sensor(Institute of Electrical and Electronics Engineers Inc., 2015) Ranjana, J.S.; Bhatt, P.; Deshmukh, P.; Sangala, B.R.; Satyanarayan, M.N.; Umesh, G.; Prabhu, S.S.We demonstrate the sensing capability of InSb based planar THz waveguide with stubs, which can sense biomolecules of a few micro liter quantity in de-ionized (DI) water. We chose Bovine Serum Albumin (BSA), a well-known standard protein molecule to investigate the sensing property. The calculated absorption coefficient from the Fourier transformed transmission characteristics show prominent changes with different concentrations of BSA, demonstrating the potential application of the device to function as a simple THz sensor. © 2015 IEEE.Item Resonant Terahertz InSb Waveguide Device for Sensing Polymers(Springer New York LLC barbara.b.bertram@gsk.com, 2016) Shourie, S.R.J.; Bhatt, P.; Deshmukh, P.; Sangala, B.R.; Satyanarayan, M.N.; Umesh, G.; Prabhu, S.S.We have demonstrated the possibility of employing a device, designed to operate at terahertz (THz) frequencies, for sensing materials. The device consists of a waveguide section with a pair of stubs located at the middle and oriented transversely to the waveguide axis. The two stubs function as a resonator and, hence, the device would behave as a filter in the THz domain. The device was fabricated by laser micromachining of InSb pellets and was characterized by THz time-domain transmission spectroscopy. For a waveguide width of 740 ?m and stub length of 990 ?m, a transmission minimum is seen to occur at 0.265 THz. We investigated the capability of the device to sense polystyrene, dissolved in toluene, loaded into the stubs. The consequent change in the refractive index in the stubs alters the transmitted signal intensity. Our results show that, a change in concentration of polystyrene even by 1 mol/L, leads to measurable change in the transmission coefficient close to the resonant frequency of the device. Thus, our device operating at THz frequencies shows promising potential as chemical and bio sensors. © 2016, Springer Science+Business Media New York.