Pub Date : 2021-08-29DOI: 10.1109/IRMMW-THz50926.2021.9567140
S. Mansourzadeh, T. Vogel, M. Shalaby, F. Wulf, C. Saraceno
We demonstrate optical rectification in BNA organic crystals using bursts of pulses from a high-power thin-disk oscillator at 13.3 MHz repetition rate. We measure an average power of 0.95 mW at 10% duty cycle with a conversion efficiency of 4×10-4. To the best of our knowledge, this is the highest average power reported with commercially available BNA so far. The detected THz spectrum bandwidth spans up to 6 THz.
{"title":"Milliwatt-average power broadband THz source at 13.3 MHz repetition rate using diamond-cooled organic crystal BNA","authors":"S. Mansourzadeh, T. Vogel, M. Shalaby, F. Wulf, C. Saraceno","doi":"10.1109/IRMMW-THz50926.2021.9567140","DOIUrl":"https://doi.org/10.1109/IRMMW-THz50926.2021.9567140","url":null,"abstract":"We demonstrate optical rectification in BNA organic crystals using bursts of pulses from a high-power thin-disk oscillator at 13.3 MHz repetition rate. We measure an average power of 0.95 mW at 10% duty cycle with a conversion efficiency of 4×10-4. To the best of our knowledge, this is the highest average power reported with commercially available BNA so far. The detected THz spectrum bandwidth spans up to 6 THz.","PeriodicalId":6852,"journal":{"name":"2021 46th International Conference on Infrared, Millimeter and Terahertz Waves (IRMMW-THz)","volume":"13 1","pages":"1-2"},"PeriodicalIF":0.0,"publicationDate":"2021-08-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75013281","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-08-29DOI: 10.1109/IRMMW-THz50926.2021.9566817
S. Eliet, A. Cuisset, F. Hindle, J. Lampin, R. Peretti
We improved the spectral resolution of THz time domain spectroscopy beyond the limit given by the delay line length. The constraint reconstruction algorithm used successfully depicted the 1.21 THz NH3 doublet separated by ~400MHz in experimental data despite the 1.2 GHz delay line limitation.
{"title":"Super resolution of a 400 MHz rotational line doublet with a TDS using a 850 ps long delay line","authors":"S. Eliet, A. Cuisset, F. Hindle, J. Lampin, R. Peretti","doi":"10.1109/IRMMW-THz50926.2021.9566817","DOIUrl":"https://doi.org/10.1109/IRMMW-THz50926.2021.9566817","url":null,"abstract":"We improved the spectral resolution of THz time domain spectroscopy beyond the limit given by the delay line length. The constraint reconstruction algorithm used successfully depicted the 1.21 THz NH3 doublet separated by ~400MHz in experimental data despite the 1.2 GHz delay line limitation.","PeriodicalId":6852,"journal":{"name":"2021 46th International Conference on Infrared, Millimeter and Terahertz Waves (IRMMW-THz)","volume":"42 1","pages":"1-2"},"PeriodicalIF":0.0,"publicationDate":"2021-08-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75187479","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-08-29DOI: 10.1109/IRMMW-THz50926.2021.9566981
K. Froberger, M. Faucher, B. Walter, M. Lavancier, R. Peretti, J. Lampin, G. Ducournau, S. Barbieri
We report the operation of a Terahertz (THz) detector exploiting the bi-material effect to resonantly excite a cantilever (CL) of micrometric size. The detector is fabricated on a SOI substrate and coupling to the incident THz radiation is obtained using two coupled aluminum half-dipole antennas. The induced CL deflection is readout optically with a 1.5µm laser. At 300K and 2.5THz, we obtain a peak responsivity of ~2 x 108pm/W for the fundamental bending mode. This yields a NEP of ~20nW/Hz1/2 at 2.5THz, i.e. of ~2nW/Hz1/2 at 3.8THz, corresponding to the antenna peak absorption. Finally, the low mechanical quality factor of the mode grants a broad frequency response of approximately 100kHz, i.e. a response time of ~10 μs.
{"title":"SOI-based opto-mechanical Terahertz bolometer operating at room temperature with microsecond response time","authors":"K. Froberger, M. Faucher, B. Walter, M. Lavancier, R. Peretti, J. Lampin, G. Ducournau, S. Barbieri","doi":"10.1109/IRMMW-THz50926.2021.9566981","DOIUrl":"https://doi.org/10.1109/IRMMW-THz50926.2021.9566981","url":null,"abstract":"We report the operation of a Terahertz (THz) detector exploiting the bi-material effect to resonantly excite a cantilever (CL) of micrometric size. The detector is fabricated on a SOI substrate and coupling to the incident THz radiation is obtained using two coupled aluminum half-dipole antennas. The induced CL deflection is readout optically with a 1.5µm laser. At 300K and 2.5THz, we obtain a peak responsivity of ~2 x 108pm/W for the fundamental bending mode. This yields a NEP of ~20nW/Hz1/2 at 2.5THz, i.e. of ~2nW/Hz1/2 at 3.8THz, corresponding to the antenna peak absorption. Finally, the low mechanical quality factor of the mode grants a broad frequency response of approximately 100kHz, i.e. a response time of ~10 μs.","PeriodicalId":6852,"journal":{"name":"2021 46th International Conference on Infrared, Millimeter and Terahertz Waves (IRMMW-THz)","volume":"1 1","pages":"1-2"},"PeriodicalIF":0.0,"publicationDate":"2021-08-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73071210","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-08-29DOI: 10.1109/IRMMW-THz50926.2021.9566849
P. Liang, Chi Zhang, X. Qi, Zheng Yan, T. Song, Wei Wang, Diwei Liu
In this paper, an active millimeter-wave (mmWave) synthetic aperture radar (SAR) imaging system is utilized to achieve high-resolution holographic image of concealed objects at different distances. To realize a synthetic aperture over the target scene, the system consists of a two-dimensional fully controllable translational platform which can scan in horizontal and vertical directions respectively. For holography reconstruction of concealed objects, the frequency-modulated continuous-wave (FMCW) radar with 4GHz bandwidth is employed, meanwhile, the wavenumber-domain 3-D holographic imaging algorithm based on the system is investigated. The experimental results confirm that our system and algorithm are valid.
{"title":"Millimeter-Wave SAR for Concealed Item Holographic Imaging","authors":"P. Liang, Chi Zhang, X. Qi, Zheng Yan, T. Song, Wei Wang, Diwei Liu","doi":"10.1109/IRMMW-THz50926.2021.9566849","DOIUrl":"https://doi.org/10.1109/IRMMW-THz50926.2021.9566849","url":null,"abstract":"In this paper, an active millimeter-wave (mmWave) synthetic aperture radar (SAR) imaging system is utilized to achieve high-resolution holographic image of concealed objects at different distances. To realize a synthetic aperture over the target scene, the system consists of a two-dimensional fully controllable translational platform which can scan in horizontal and vertical directions respectively. For holography reconstruction of concealed objects, the frequency-modulated continuous-wave (FMCW) radar with 4GHz bandwidth is employed, meanwhile, the wavenumber-domain 3-D holographic imaging algorithm based on the system is investigated. The experimental results confirm that our system and algorithm are valid.","PeriodicalId":6852,"journal":{"name":"2021 46th International Conference on Infrared, Millimeter and Terahertz Waves (IRMMW-THz)","volume":"1 1","pages":"1-2"},"PeriodicalIF":0.0,"publicationDate":"2021-08-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75211772","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-08-29DOI: 10.1109/IRMMW-THz50926.2021.9567502
F. Meng, Hantian Gu, M. Thomson, H. Roskos
We observe strong coupling between the plasmonic dark mode of electromagnetically induced transparency (EIT) metamaterials with the photons in a 1D photonic crystal cavity in the terahertz frequency range. The observed splitting depends on the strength of magnetic interaction between the plasmon bright-and dark-modes of the EIT metamaterials, demonstrating that the coupling between the dark mode and the cavity photons is mediated by the plasmonic bright mode.
{"title":"Strong coupling of a plasmonic dark mode with photons in a photonic crystal cavity","authors":"F. Meng, Hantian Gu, M. Thomson, H. Roskos","doi":"10.1109/IRMMW-THz50926.2021.9567502","DOIUrl":"https://doi.org/10.1109/IRMMW-THz50926.2021.9567502","url":null,"abstract":"We observe strong coupling between the plasmonic dark mode of electromagnetically induced transparency (EIT) metamaterials with the photons in a 1D photonic crystal cavity in the terahertz frequency range. The observed splitting depends on the strength of magnetic interaction between the plasmon bright-and dark-modes of the EIT metamaterials, demonstrating that the coupling between the dark mode and the cavity photons is mediated by the plasmonic bright mode.","PeriodicalId":6852,"journal":{"name":"2021 46th International Conference on Infrared, Millimeter and Terahertz Waves (IRMMW-THz)","volume":"95 1","pages":"1-1"},"PeriodicalIF":0.0,"publicationDate":"2021-08-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75272477","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-08-29DOI: 10.1109/IRMMW-THz50926.2021.9567648
I. Bandurkin, A. Savilov
Using non-axisymmetric electron beams in single-cavity self-exciting gyromultipliers with simple axisymmetric cavities allows the realization of an arbitrary multiplication factor. The most efficient is using a pencil-like electron beam displaced from the cavity axis as it allows, according to simulations, achieving a power of up to several watts in the THz frequency range when operating at the fourth cyclotron harmonic.
{"title":"Gyromultipliers with Asymmetric Electron Beams","authors":"I. Bandurkin, A. Savilov","doi":"10.1109/IRMMW-THz50926.2021.9567648","DOIUrl":"https://doi.org/10.1109/IRMMW-THz50926.2021.9567648","url":null,"abstract":"Using non-axisymmetric electron beams in single-cavity self-exciting gyromultipliers with simple axisymmetric cavities allows the realization of an arbitrary multiplication factor. The most efficient is using a pencil-like electron beam displaced from the cavity axis as it allows, according to simulations, achieving a power of up to several watts in the THz frequency range when operating at the fourth cyclotron harmonic.","PeriodicalId":6852,"journal":{"name":"2021 46th International Conference on Infrared, Millimeter and Terahertz Waves (IRMMW-THz)","volume":"3 1","pages":"1-2"},"PeriodicalIF":0.0,"publicationDate":"2021-08-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75891534","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-08-29DOI: 10.1109/IRMMW-THz50926.2021.9567646
D. Headland, W. Withayachumnankul, Xiongbin Yu, M. Fujita, T. Nagatsuma
We present a novel in-slab beamforming technique that leverages optical tunneling and leaky-wave phenomena. In this way, a frequency-scanning focused beam is projected into a micro-scale silicon slab, and by collecting this beam at a single point with an inverse flare, an integrated all-intrinsic-silicon filter is realized. This technique holds great potential to realize efficient, broadband, all-dielectric frequency-division multiplexers for terahertz, infrared, and visible-frequency waves.
{"title":"Integrated Terahertz Tunneling Filter","authors":"D. Headland, W. Withayachumnankul, Xiongbin Yu, M. Fujita, T. Nagatsuma","doi":"10.1109/IRMMW-THz50926.2021.9567646","DOIUrl":"https://doi.org/10.1109/IRMMW-THz50926.2021.9567646","url":null,"abstract":"We present a novel in-slab beamforming technique that leverages optical tunneling and leaky-wave phenomena. In this way, a frequency-scanning focused beam is projected into a micro-scale silicon slab, and by collecting this beam at a single point with an inverse flare, an integrated all-intrinsic-silicon filter is realized. This technique holds great potential to realize efficient, broadband, all-dielectric frequency-division multiplexers for terahertz, infrared, and visible-frequency waves.","PeriodicalId":6852,"journal":{"name":"2021 46th International Conference on Infrared, Millimeter and Terahertz Waves (IRMMW-THz)","volume":"42 1","pages":"1-2"},"PeriodicalIF":0.0,"publicationDate":"2021-08-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73173681","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-08-29DOI: 10.1109/IRMMW-THz50926.2021.9567292
Xue-Yong Ding, Hong-rui Su, Lian-sheng Wang
In order to construct a cavity with a high-frequency and high-order single TM operating mode and also are favorable to the mode selectivity, the tapered double sinusoidal grooves structure is proposed. On the basis of ordinary sinusoidal grooves structure, the auxiliary sinusoidal distribution with smaller etching period is superimposed, and the taper is added on the inner and outer conductor walls to form the tapered double sinusoidal grooves coaxial Bragg structure. Through the FORTRAN software programming simulation experiments, we can see that it is different from the working mode TE mode. When the positive taper double sinusoidal grooves is adopted, the band gap overlap phenomenon deteriorates. The use of negative taper double sinusoidal grooves coaxial Bragg structure as the reflector can effectively suppress the band gap overlap phenomenon, the bandwidth gradually becomes wider as the increase of the taper angle, and the working mode TM62 and the competition mode TE61 can further separate. This provides a theoretical reference for the design of a coaxial Bragg reflector with a high-frequency and high-order single TM operating mode.
{"title":"Characters of frequency response of TM mode with the Tapered Double Sinusoidal Grooves structure operating at 0.35THz frequency","authors":"Xue-Yong Ding, Hong-rui Su, Lian-sheng Wang","doi":"10.1109/IRMMW-THz50926.2021.9567292","DOIUrl":"https://doi.org/10.1109/IRMMW-THz50926.2021.9567292","url":null,"abstract":"In order to construct a cavity with a high-frequency and high-order single TM operating mode and also are favorable to the mode selectivity, the tapered double sinusoidal grooves structure is proposed. On the basis of ordinary sinusoidal grooves structure, the auxiliary sinusoidal distribution with smaller etching period is superimposed, and the taper is added on the inner and outer conductor walls to form the tapered double sinusoidal grooves coaxial Bragg structure. Through the FORTRAN software programming simulation experiments, we can see that it is different from the working mode TE mode. When the positive taper double sinusoidal grooves is adopted, the band gap overlap phenomenon deteriorates. The use of negative taper double sinusoidal grooves coaxial Bragg structure as the reflector can effectively suppress the band gap overlap phenomenon, the bandwidth gradually becomes wider as the increase of the taper angle, and the working mode TM62 and the competition mode TE61 can further separate. This provides a theoretical reference for the design of a coaxial Bragg reflector with a high-frequency and high-order single TM operating mode.","PeriodicalId":6852,"journal":{"name":"2021 46th International Conference on Infrared, Millimeter and Terahertz Waves (IRMMW-THz)","volume":"7 1","pages":"1-2"},"PeriodicalIF":0.0,"publicationDate":"2021-08-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74520040","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-08-29DOI: 10.1109/IRMMW-THz50926.2021.9567585
Xurong Li, M. Jarrahi
Images captured by terahertz time-domain imaging systems are information rich because of the wide imaging bandwidth. However, the speed of the state-of-the-art terahertz time-domain imaging systems is still limited by their single-pixel imaging modality. Here, we present terahertz time-domain imaging via a terahertz focal-plane array, which eliminated the need for mechanical raster scanning. We demonstrate resolving 63-pixel terahertz images up to 2.9 THz.
{"title":"Broadband Terahertz Time-Domain Imaging via a 63-Pixel Focal-plane Array","authors":"Xurong Li, M. Jarrahi","doi":"10.1109/IRMMW-THz50926.2021.9567585","DOIUrl":"https://doi.org/10.1109/IRMMW-THz50926.2021.9567585","url":null,"abstract":"Images captured by terahertz time-domain imaging systems are information rich because of the wide imaging bandwidth. However, the speed of the state-of-the-art terahertz time-domain imaging systems is still limited by their single-pixel imaging modality. Here, we present terahertz time-domain imaging via a terahertz focal-plane array, which eliminated the need for mechanical raster scanning. We demonstrate resolving 63-pixel terahertz images up to 2.9 THz.","PeriodicalId":6852,"journal":{"name":"2021 46th International Conference on Infrared, Millimeter and Terahertz Waves (IRMMW-THz)","volume":"189 1","pages":"1-2"},"PeriodicalIF":0.0,"publicationDate":"2021-08-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72777015","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-08-29DOI: 10.1109/IRMMW-THz50926.2021.9567251
Di Li, Wenjie Zhang, Jibo Fu, Peng Suo, Xian Lin, G. Ma
In this work, by employing ultrafast optical pump-probe spectroscopy, we investigated the photocarrier dynamics as well as the thickness dependent interlayer coherent phonon modes in PdSe2 films. Two low-frequency phonon modes in PdSe2 films are identified after photoexcitation at 780 nm. The higher frequency mode is ascribed to the interlayer breathing mode, and the lower one is assigned to the standing wave mode, and the frequency variation and the related parameters (interlayer force constant and sound velocity) of the two modes are investigated.
{"title":"Observation of Layer Dependent Ultrafast Carrier dynamics and Interlayer Coherent Phonon Dynamics in PdSe2 Films","authors":"Di Li, Wenjie Zhang, Jibo Fu, Peng Suo, Xian Lin, G. Ma","doi":"10.1109/IRMMW-THz50926.2021.9567251","DOIUrl":"https://doi.org/10.1109/IRMMW-THz50926.2021.9567251","url":null,"abstract":"In this work, by employing ultrafast optical pump-probe spectroscopy, we investigated the photocarrier dynamics as well as the thickness dependent interlayer coherent phonon modes in PdSe2 films. Two low-frequency phonon modes in PdSe2 films are identified after photoexcitation at 780 nm. The higher frequency mode is ascribed to the interlayer breathing mode, and the lower one is assigned to the standing wave mode, and the frequency variation and the related parameters (interlayer force constant and sound velocity) of the two modes are investigated.","PeriodicalId":6852,"journal":{"name":"2021 46th International Conference on Infrared, Millimeter and Terahertz Waves (IRMMW-THz)","volume":"39 ","pages":"1-2"},"PeriodicalIF":0.0,"publicationDate":"2021-08-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72546879","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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