Pub Date : 2022-03-04DOI: 10.1109/WRAP54064.2022.9758324
Saurabh Kishen, Jinal Tapar, N. Emani
Tunable directional emission from electrically driven sources is essential for applications involving on-chip nano-circuits, sensing and quantum information processing. Here, we numerically demonstrate wavelength selective, switchable directional emission from periodic, nano-strip metal-insulator-metal tunnel junctions. Using two excitation sources, we show that our structure can efficiently redirect two different wavelengths in opposite directions when the excitation is switched. We achieved a peak directivity of 21.5 and 25.8 for wavelengths of 692 nm and 738 nm, respectively. The emission angle can be tuned by varying the periodicity, thereby paving the way for on-chip multiplexing.
{"title":"Wavelength Selective Beam Switching Using Electrically Driven Nano-Strip MIM Tunnel Junctions","authors":"Saurabh Kishen, Jinal Tapar, N. Emani","doi":"10.1109/WRAP54064.2022.9758324","DOIUrl":"https://doi.org/10.1109/WRAP54064.2022.9758324","url":null,"abstract":"Tunable directional emission from electrically driven sources is essential for applications involving on-chip nano-circuits, sensing and quantum information processing. Here, we numerically demonstrate wavelength selective, switchable directional emission from periodic, nano-strip metal-insulator-metal tunnel junctions. Using two excitation sources, we show that our structure can efficiently redirect two different wavelengths in opposite directions when the excitation is switched. We achieved a peak directivity of 21.5 and 25.8 for wavelengths of 692 nm and 738 nm, respectively. The emission angle can be tuned by varying the periodicity, thereby paving the way for on-chip multiplexing.","PeriodicalId":363857,"journal":{"name":"2022 Workshop on Recent Advances in Photonics (WRAP)","volume":"42 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-03-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132524387","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 : 2022-03-04DOI: 10.1109/WRAP54064.2022.9758330
B. Kumar, N. Gupta
In Perovskite-silicon tandem (PST) solar cells, the final current density of cell is decided by the smallest current generated by the perovskite sub cells, as the two cells are in series. Commonly, processing defects occur in thick perovskite layers, which limits the thickness of top perovskite layer. Due to the limited thickness of top perovskite cell (PerC), the cell cannot absorb the photons as it could be, limits the final current density of PST cell. To increase the top cell current, this paper presents the design and discusses the role of nanostructured intermediate reflector (IR). The bottom C-Si cell is optimized to match with the top cell current density. The numerical analysis of the proposed design shows that there is only slight increase in the top cell current density with the presented nanostructured IR. The theoretical analysis is done to understand, the reason behind getting only a slight increase in top cell absorption with patterned IR using effective medium theory. It has been observed that the low index contrast of the materials involved in the IR design are the main reason for low absorption enhancement. The methods that can be used as an alternate to the proposed design to further improve the top cell current density are also discussed.
{"title":"Design and Optical Studies for Nanostructure Intermediate Reflector based Perovskite Silicon Tandem solar cell","authors":"B. Kumar, N. Gupta","doi":"10.1109/WRAP54064.2022.9758330","DOIUrl":"https://doi.org/10.1109/WRAP54064.2022.9758330","url":null,"abstract":"In Perovskite-silicon tandem (PST) solar cells, the final current density of cell is decided by the smallest current generated by the perovskite sub cells, as the two cells are in series. Commonly, processing defects occur in thick perovskite layers, which limits the thickness of top perovskite layer. Due to the limited thickness of top perovskite cell (PerC), the cell cannot absorb the photons as it could be, limits the final current density of PST cell. To increase the top cell current, this paper presents the design and discusses the role of nanostructured intermediate reflector (IR). The bottom C-Si cell is optimized to match with the top cell current density. The numerical analysis of the proposed design shows that there is only slight increase in the top cell current density with the presented nanostructured IR. The theoretical analysis is done to understand, the reason behind getting only a slight increase in top cell absorption with patterned IR using effective medium theory. It has been observed that the low index contrast of the materials involved in the IR design are the main reason for low absorption enhancement. The methods that can be used as an alternate to the proposed design to further improve the top cell current density are also discussed.","PeriodicalId":363857,"journal":{"name":"2022 Workshop on Recent Advances in Photonics (WRAP)","volume":"20 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-03-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114814116","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 : 2022-03-04DOI: 10.1109/WRAP54064.2022.9758240
J. F. Algorri, L. Rodríguez-Cobo, D. Zografopoulos, Consiglio Nazionale, Delle Ricerche, F.Dell’Olio, J. López-Higuera, P. Roldán-Varona, J. Sánchez-Pena
This work proposes and theoretically demonstrates a double electromagnetic induced transparency resonance generated by a novel dielectric metasurface consisting of a periodic array of square slots. The resonances stem from symmetry-protected bound states in the continuum whose quality factor tends to infinity when the structure is symmetric. The quasi-bound states in the continuum supported by the asymmetric metasurface can be exploited to obtain double high quality factor resonances in transmission (electromagnetic induced transparency like effect) that can be modulated with the external refractive index for sensing.
{"title":"Double electromagnetically induced transparency resonance in slotted metasurfaces supporting bound states in the continuum","authors":"J. F. Algorri, L. Rodríguez-Cobo, D. Zografopoulos, Consiglio Nazionale, Delle Ricerche, F.Dell’Olio, J. López-Higuera, P. Roldán-Varona, J. Sánchez-Pena","doi":"10.1109/WRAP54064.2022.9758240","DOIUrl":"https://doi.org/10.1109/WRAP54064.2022.9758240","url":null,"abstract":"This work proposes and theoretically demonstrates a double electromagnetic induced transparency resonance generated by a novel dielectric metasurface consisting of a periodic array of square slots. The resonances stem from symmetry-protected bound states in the continuum whose quality factor tends to infinity when the structure is symmetric. The quasi-bound states in the continuum supported by the asymmetric metasurface can be exploited to obtain double high quality factor resonances in transmission (electromagnetic induced transparency like effect) that can be modulated with the external refractive index for sensing.","PeriodicalId":363857,"journal":{"name":"2022 Workshop on Recent Advances in Photonics (WRAP)","volume":"37 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-03-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115070739","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 : 2022-03-04DOI: 10.1109/WRAP54064.2022.9758310
Chandan Ghorui, A. Chaudhary, P. Kumar, Koalla Rajesh
We report the time domain THz-based optical evaluation of different sized soil samples obtained from the jungle and defense test range of the country. The soil samples testing exercise using reflection mode time-domain terahertz (THz) spectroscopy technique is related to the development of a small range THz radar system. The study helps us to understand the role of soil particles in terms of identifying the presence of minerals /ores including organic and explosives contaminants. The E-M waves between 0.1- 4.0 THz range provide significant information of the soil of different origins in terms of refractive index and absorption coefficients etc.
{"title":"Study of THz time-domain spectroscopy based optical properties and detection of minerals and explosives from soil samples of different origins","authors":"Chandan Ghorui, A. Chaudhary, P. Kumar, Koalla Rajesh","doi":"10.1109/WRAP54064.2022.9758310","DOIUrl":"https://doi.org/10.1109/WRAP54064.2022.9758310","url":null,"abstract":"We report the time domain THz-based optical evaluation of different sized soil samples obtained from the jungle and defense test range of the country. The soil samples testing exercise using reflection mode time-domain terahertz (THz) spectroscopy technique is related to the development of a small range THz radar system. The study helps us to understand the role of soil particles in terms of identifying the presence of minerals /ores including organic and explosives contaminants. The E-M waves between 0.1- 4.0 THz range provide significant information of the soil of different origins in terms of refractive index and absorption coefficients etc.","PeriodicalId":363857,"journal":{"name":"2022 Workshop on Recent Advances in Photonics (WRAP)","volume":"23 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-03-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123292383","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 : 2022-03-04DOI: 10.1109/WRAP54064.2022.9758352
Shivangi Dubey, Amarendra Pratap Singh, Abhishek Tiwari, Charu S Tripathi
Technological advancement in warfare has wide inclusion of laser-based weaponry. Implementation of a system which is used for identification, detection and recognition of approaching laser radiation on armored combat vehicles is essential. The paper delineates novel configuration to enhance the accuracy of threat detection. This is ensured by the optical design configuration which will reduce stray light issue in linear array of photodetectors. Parameters affecting the detection of accurate angle of incidence are discussed so as to achieve high angular resolution. The detector array is further analyzed to achieve constant angular resolution over the complete field of view. Designing of the front-end optical system is done in a way that there is linear variation between angle of arrival (AOA) and spatial position of the active area of linear detector array. It also focuses attention on the technological challenges in the designing of opto-electronic beam spotting sensor and any variation in beam parameter due to atmospheric hindrance.
{"title":"Coherent Light Beam Spotting Sensor Optics for the Battlefield Surveillance","authors":"Shivangi Dubey, Amarendra Pratap Singh, Abhishek Tiwari, Charu S Tripathi","doi":"10.1109/WRAP54064.2022.9758352","DOIUrl":"https://doi.org/10.1109/WRAP54064.2022.9758352","url":null,"abstract":"Technological advancement in warfare has wide inclusion of laser-based weaponry. Implementation of a system which is used for identification, detection and recognition of approaching laser radiation on armored combat vehicles is essential. The paper delineates novel configuration to enhance the accuracy of threat detection. This is ensured by the optical design configuration which will reduce stray light issue in linear array of photodetectors. Parameters affecting the detection of accurate angle of incidence are discussed so as to achieve high angular resolution. The detector array is further analyzed to achieve constant angular resolution over the complete field of view. Designing of the front-end optical system is done in a way that there is linear variation between angle of arrival (AOA) and spatial position of the active area of linear detector array. It also focuses attention on the technological challenges in the designing of opto-electronic beam spotting sensor and any variation in beam parameter due to atmospheric hindrance.","PeriodicalId":363857,"journal":{"name":"2022 Workshop on Recent Advances in Photonics (WRAP)","volume":"25 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-03-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130277200","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 : 2022-03-04DOI: 10.1109/WRAP54064.2022.9758347
Kuldeep Jajoria, C. Jha, A. Chakraborty, Himanshu Shekhar
In this paper, we present the characterization of an FBG sensor to detect ultrasound in the MHz frequency range which is used in biomedical ultrasound. The linearity, sensitivity, and repeatability of the sensor were tested at 1 MHz, 5 MHz, and 10 MHz in the peak acoustic rarefactional pressure range of 0-1.2 MPa. The FBG showed good linearity (R-Squared=0.98), high sensitivity (0.82 V/MPa at 10 MHz), and high repeatability (coefficient of variation ≤ 5.5%). Our results show the potential of FBG sensors to detect ultrasound for biomedical applications.
{"title":"Detection of ultrasound up to 10 MHz frequency using an FBG sensor","authors":"Kuldeep Jajoria, C. Jha, A. Chakraborty, Himanshu Shekhar","doi":"10.1109/WRAP54064.2022.9758347","DOIUrl":"https://doi.org/10.1109/WRAP54064.2022.9758347","url":null,"abstract":"In this paper, we present the characterization of an FBG sensor to detect ultrasound in the MHz frequency range which is used in biomedical ultrasound. The linearity, sensitivity, and repeatability of the sensor were tested at 1 MHz, 5 MHz, and 10 MHz in the peak acoustic rarefactional pressure range of 0-1.2 MPa. The FBG showed good linearity (R-Squared=0.98), high sensitivity (0.82 V/MPa at 10 MHz), and high repeatability (coefficient of variation ≤ 5.5%). Our results show the potential of FBG sensors to detect ultrasound for biomedical applications.","PeriodicalId":363857,"journal":{"name":"2022 Workshop on Recent Advances in Photonics (WRAP)","volume":"49 36 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-03-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131053091","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 : 2022-03-04DOI: 10.1109/WRAP54064.2022.9758350
Rajesh Kumar, S. Ramakrishna
Composite grating of Nitrogen-vacancy (N-V) centers nanodiamond (ND) is fabricated using soft lithography. Wide distribution with enhanced radiated powers from NDs is observed using confocal measurements. Numerical simulations reveal that this distribution arises from random emitting dipoles orientations inside the ND.
{"title":"Composite Nitrogen-Vacancy Centers Nanodiamonds Grating using Soft Lithography","authors":"Rajesh Kumar, S. Ramakrishna","doi":"10.1109/WRAP54064.2022.9758350","DOIUrl":"https://doi.org/10.1109/WRAP54064.2022.9758350","url":null,"abstract":"Composite grating of Nitrogen-vacancy (N-V) centers nanodiamond (ND) is fabricated using soft lithography. Wide distribution with enhanced radiated powers from NDs is observed using confocal measurements. Numerical simulations reveal that this distribution arises from random emitting dipoles orientations inside the ND.","PeriodicalId":363857,"journal":{"name":"2022 Workshop on Recent Advances in Photonics (WRAP)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-03-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131196707","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 : 2022-03-04DOI: 10.1109/WRAP54064.2022.9758344
Yogesh Kumar Verma, Soumya Kumari, S. Tripathi
Exploiting the large field confinement of transverse magnetic mode in low refractive index region, we proposed and analyze refractometer using narrow width, high index contrast micro-ring resonator. For the waveguide width of 60 nm, a sensitivity of 610 nm/RIU is achieved with figure of merit 228.4 RIU−1 and limit of detection $4.4times 10^{-3}$ in the range of 1.33-1.37 of refractive indices.
{"title":"Refractometry using Large Index Contrast Narrow Width Micro-ring Resonator","authors":"Yogesh Kumar Verma, Soumya Kumari, S. Tripathi","doi":"10.1109/WRAP54064.2022.9758344","DOIUrl":"https://doi.org/10.1109/WRAP54064.2022.9758344","url":null,"abstract":"Exploiting the large field confinement of transverse magnetic mode in low refractive index region, we proposed and analyze refractometer using narrow width, high index contrast micro-ring resonator. For the waveguide width of 60 nm, a sensitivity of 610 nm/RIU is achieved with figure of merit 228.4 RIU−1 and limit of detection $4.4times 10^{-3}$ in the range of 1.33-1.37 of refractive indices.","PeriodicalId":363857,"journal":{"name":"2022 Workshop on Recent Advances in Photonics (WRAP)","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-03-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125985514","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 : 2022-03-04DOI: 10.1109/WRAP54064.2022.9758318
Eshita Mukherjee, Jayakumar Pillanagrovi, Dhruv Bhatnagar, S. Dutta-Gupta
The real time monitoring of gold nanoparticles (AuNPs) deposition on a modified surface is experimentally investigated. Reflectance of the substrate is used to monitor the deposition of during the deposition of AuNPs within the microfluidic chamber. The reflectance is strongly dependent on the particle density at a given point and exhibits both dips and peaks. The assembly kinetics are compared for both modified and un-modified surfaces. It is shown that the assembly kinetics can be increased significantly due to the presence of appropriate charge species due to the surface modification.
{"title":"Real time monitoring of assembly of plasmonic nanoparticles on polyelectrolyte coated surfaces","authors":"Eshita Mukherjee, Jayakumar Pillanagrovi, Dhruv Bhatnagar, S. Dutta-Gupta","doi":"10.1109/WRAP54064.2022.9758318","DOIUrl":"https://doi.org/10.1109/WRAP54064.2022.9758318","url":null,"abstract":"The real time monitoring of gold nanoparticles (AuNPs) deposition on a modified surface is experimentally investigated. Reflectance of the substrate is used to monitor the deposition of during the deposition of AuNPs within the microfluidic chamber. The reflectance is strongly dependent on the particle density at a given point and exhibits both dips and peaks. The assembly kinetics are compared for both modified and un-modified surfaces. It is shown that the assembly kinetics can be increased significantly due to the presence of appropriate charge species due to the surface modification.","PeriodicalId":363857,"journal":{"name":"2022 Workshop on Recent Advances in Photonics (WRAP)","volume":"33 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-03-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130080783","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 : 2022-03-04DOI: 10.1109/WRAP54064.2022.9758242
Seyed Morteza Ebadi
This paper reports the design and simulation results of an ultra-compact multi-peak narrow-band plasmonic absorber in a MIM waveguide. It is observed that by tuning the coupling distance between input port and adjacent triangle, one can easily adjust the resonance wavelengths of absorption spectrum.
{"title":"Highly-Miniaturized Multi-Peak Narrow-Band Plasmonic Absorber based on Triangular Arrays","authors":"Seyed Morteza Ebadi","doi":"10.1109/WRAP54064.2022.9758242","DOIUrl":"https://doi.org/10.1109/WRAP54064.2022.9758242","url":null,"abstract":"This paper reports the design and simulation results of an ultra-compact multi-peak narrow-band plasmonic absorber in a MIM waveguide. It is observed that by tuning the coupling distance between input port and adjacent triangle, one can easily adjust the resonance wavelengths of absorption spectrum.","PeriodicalId":363857,"journal":{"name":"2022 Workshop on Recent Advances in Photonics (WRAP)","volume":"16 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-03-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126848485","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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