Frontiers in photonics最新文献

{"title":"Dielectric metasurfaces for refractive index sensing towards anemia detection","authors":"Dhananjoy De, R. Vijaya","doi":"10.3389/fphot.2023.1234060","DOIUrl":"https://doi.org/10.3389/fphot.2023.1234060","url":null,"abstract":"In this article, an all-dielectric metasurface-based refractive index sensor is proposed in the near-infrared wavelength regime. The sensor employs well known magnetic dipole and electric dipole resonances for sensing. We have also computationally demonstrated that sensitivity and figure of merit of the sensor can be enhanced by increasing the interaction between the electromagnetic field and the surrounding medium using a suitable design modification. The proposed improved sensor can be used in anemia detection and also to measure its progress as proposed in this work.","PeriodicalId":73099,"journal":{"name":"Frontiers in photonics","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-07-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42874899","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}

{"title":"Adaptive plasmonic metasurfaces for radiative cooling and passive thermoregulation","authors":"Azadeh Didari-Bader, N. M. Estakhri, N. Mohammadi Estakhri","doi":"10.3389/fphot.2023.1193479","DOIUrl":"https://doi.org/10.3389/fphot.2023.1193479","url":null,"abstract":"In this work, we investigate a class of planar photonic structures operating as passive thermoregulators. The radiative cooling process is adjusted through the incorporation of a phase change material (Vanadium Dioxide, VO2) in conjunction with a layer of transparent conductive oxide (Aluminum-doped Zinc Oxide, AZO). VO2 is known to undergo a phase transition from the “dielectric” phase to the “plasmonic” or “metallic” phase at a critical temperature close to 68°C. In addition, AZO shows plasmonic properties at the long-wave infrared spectrum, which, combined with VO2, provides a rich platform to achieve low reflections across the atmospheric transparency window, as demanded in radiative cooling applications, while also maintaining a compact size. Using numerical analysis, we study two classes of patterned and non-patterned compact multilayer metal-dielectric-metal metasurfaces, aiming to maximize the overall absorption in the first atmospheric transparency window (8–13 µm) while maintaining a high reflection across the solar spectrum (0.3–2.5 µm). Surfaces are initially designed based on a round of coarse optimization and further improved through analyzing the impact of geometric parameters such as size and periodicity of the metasurface elements. Our findings are relevant to applications in thermal regulation systems and passive radiative cooling of high-temperature devices, such as electronic elements.","PeriodicalId":73099,"journal":{"name":"Frontiers in photonics","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49654859","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}

{"title":"Editorial: Semiconductor laser dynamics and its applications","authors":"Anbang Wang, Cheng Wang","doi":"10.3389/fphot.2023.1227282","DOIUrl":"https://doi.org/10.3389/fphot.2023.1227282","url":null,"abstract":"This Research Topic focuses on the dynamics and nonlinear dynamics of semiconductor lasers as well as the applications. Over the past 30 years, semiconductor laser dynamics have undergone significant development. Rich dynamical phenomena, such as periodic oscillation, low-frequency fluctuation, spiking, chaos, and synchronization have each been detected. Notably, semiconductor laser dynamics have been incorporated into a significant number of applications, such as secure communication, optical measurement, microwave generation, and photonic information processing. In line with the ongoing development of semiconductor lasers and their updated application requirements, research focused on laser dynamics and its applications will continue to expand, introducing novel devices and methods. This Research Topic comprise three articles, which provide insight into the state of the art of semiconductor laser dynamics. Xiao et al. report a chaotic microlaser without any external perturbations. The physical mechanism of the chaos generation originates from the internal mode interaction of nearly degenerate modes. Based on this self-chaotic laser source, physical random number generation as fast as 10 Gb/s is successfully demonstrated. On the other hand, Chomet et al. present a spontaneous mode locking laser without any saturable absorbers. Continuous wave generation of picosecond pulses at a rate of 100 GHz is demonstrated, and the timing jitter of the pulse trains is as low as 110 fs. Through a theoretical model analysis, the physical mechanism is attributed to the interplay between self-phase modulation and anomalous dispersion together with light-matter interaction-induced time symmetry breaking. In addition, Roos et al. discuss the spontaneous emission noise resilience of the phase locked operation of delay-coupled nanolasers. The numerical result reveals that a polarization dephasing time of two to three times the cavity photon lifetime maximizes the system’s ability to remain phase-locked in the presence of noise-induced perturbations. The strong parameter dependence of the noise tolerance is helpful for the design of robust on-chip integrated networks of nanolasers. OPEN ACCESS","PeriodicalId":73099,"journal":{"name":"Frontiers in photonics","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-06-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41938360","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}

{"title":"On-chip liquid sensing using mid-IR plasmonics","authors":"B. Hinkov, M. David, G. Strasser, B. Schwarz, B. Lendl","doi":"10.3389/fphot.2023.1213434","DOIUrl":"https://doi.org/10.3389/fphot.2023.1213434","url":null,"abstract":"The investigation of molecules in the mid-IR spectral range has revolutionized our understanding in many fields such as atmospheric chemistry and environmental sensing for climate research or disease monitoring in medical diagnosis. While the mid-IR analysis of gas-samples is already a mature discipline, the spectroscopy of liquids is still in its infancy. However, it is a rapidly developing field of research, set to fundamentally change our knowledge of dynamical processes of molecules in liquid-phase. In this field, mid-IR plasmonics has emerged as breakthrough concept for miniaturization, enabling highly-sensitive and -selective liquid measurement tools. In this review, we give an overview over current trends and recent developments in the field of mid-IR spectroscopy of molecules in liquid phase. Special attention is given to plasmon-enhanced concepts that allow measurements in highly compact sensor schemes. Nowadays, they reach full monolithic integration, including laser, interaction section and detector on the same chip, demonstrating unprecedented operation in situ and real-time analysis of chemical processes.","PeriodicalId":73099,"journal":{"name":"Frontiers in photonics","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-06-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46957336","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}

{"title":"Fully atomistic modeling of plasmonic bimetallic nanoparticles: nanoalloys and core-shell systems","authors":"Luca Nicoli, Piero Lafiosca, P. Grobas Illobre, L. Bonatti, Tommaso Giovannini, Chiara Cappelli","doi":"10.3389/fphot.2023.1199598","DOIUrl":"https://doi.org/10.3389/fphot.2023.1199598","url":null,"abstract":"The recently developed ωFQFμ model (ACS Photonics, 9, 3,025–3,034) is extended to bimetallic nanoparticles, such as nanoalloys and core-shell systems. The method finds its grounds in basic physical concepts, such as Drude conduction theory, electrostatics, interband transitions, and quantum tunneling. The approach, which is parametrized on ab initio simulations of Ag-Au nanoalloys, is challenged against complex Ag-Au nanostructures (spheres, nanorods, and core-shell nanoparticles). Remarkable agreement with available experimental data is found, thus demonstrating the reliability of the newly developed approach.","PeriodicalId":73099,"journal":{"name":"Frontiers in photonics","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-06-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42151612","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}

{"title":"High spatial resolution imaging of light localization in hyperuniform disordered patterns of circular air pores in a dielectric slab","authors":"N. Granchi, R. Spalding, K. Stokkereit, M. Lodde, M. Petruzzella, Frank V. Otten, R. Sapienza, A. Fiore, Marian Florescu, F. Intonti","doi":"10.3389/fphot.2023.1199411","DOIUrl":"https://doi.org/10.3389/fphot.2023.1199411","url":null,"abstract":"Hyperuniform disordered photonic structures are a peculiar category of disordered photonic heterostructures located between random structures and ordered photonic crystals. These materials, thanks to the presence of a photonic bandgap, exhibit the advantages of random and ordered structures since they have been shown to support in a small spatial footprint a high density of Anderson-localized modes, which naturally occur at the bandgap edges with peculiar features like relatively high Q/V ratios. Different localization behaviors have been recently reported in hyperuniform disordered luminescent materials, with a well-established and widely studied design, based on disordered networks. Here, we explore an alternative design, based on circular holes of different sizes hyperuniformely distributed, that we investigate theoretically and experimentally by means of scanning near-field optical microscopy. We report that the spectral features of hyperuniform disordered networks can also be extended to a different design, which, in turn, displays pseudo-photonic bandgaps and light localization. The ability of generating different kinds of hyperuniform disordered photonic systems that share the same theoretical and experimental optical features can largely extend practical potentialities and integration in many optoelectronic applications.","PeriodicalId":73099,"journal":{"name":"Frontiers in photonics","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-06-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46765136","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}

{"title":"Achieving a full color palette with thickness, temperature, and humidity in cholesteric hydroxypropyl cellulose","authors":"Hong-Rui Ren, Tadeusz Balcerowski, A. G. Dumanli","doi":"10.3389/fphot.2023.1134807","DOIUrl":"https://doi.org/10.3389/fphot.2023.1134807","url":null,"abstract":"Hydroxypropyl cellulose (HPC) is a sustainable, cost-efficient, and bio-compatible cellulose derivative that forms cholesteric liquid crystalline phases in highlyconcentrated water solutions that reflects colour in the visible range. While there have been studies exploiting HPC’s structural coloration and transferring the cholesteric order of the solutions into solid form via cross-linking, there is still lack of understanding on the thermotropic mechanisms that enable the transfer of the structural ordering of the pure HPC at higher temperatures. In this work, we demonstrate the balance between the temperature, humidity, and film thickness to achieve a full color palette of pure HPC. We reveal that at the early stages of the evaporation, formation of a dense skin over the lyotropic phase facilitates the thermal expansion of the HPC during the heat treatment. Increasing the thickness, applying higher drying temperatures, and exposing the samples to higher humidity during the evaporation all result with increased pitch values that cause a red-shift in coloration in the solid state. Our analysis of the HPC samples dried in controlled temperature and humidity conditions at a fixed thickness provided an understanding of the dominance of the thermal expansion which drives the final structural organization in the solid cholesteric phase. When the thickness of the films was varied against fixed temperature and humidity conditions, the color shift from red to violet follows the thickness gradient of the sample due to the change in the drying time required to reach the solid form.","PeriodicalId":73099,"journal":{"name":"Frontiers in photonics","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-06-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47950581","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}

{"title":"Uji Toksisitas Ekstrak Daun Belimbing Wuluh (Averrhoa bilimbi L.) terhadap Ulat Grayak (Spodoptera frugiperda)","authors":"Nofripa Herlina, None Tria Pratikasari, None Novia Gesriantuti","doi":"10.37859/jp.v13i2.4710","DOIUrl":"https://doi.org/10.37859/jp.v13i2.4710","url":null,"abstract":"Belimbing wuluh merupakan pohon tropis yang tumbuh sebagai pohon liar maupun ditanam karena mengandung banyak manfaat, Belimbing wuluh bermanfaat sebagai obat tradisional dan memiliki senyawa metabolit sekunder seperti tannin, flavonoid dan saponin yang berfungsi sebagai insektisida. Penelitian ini bertujuan untuk mengetahui potensi ekstrak daun Belimbing wuluh sebagai insektisida alami terhadap ulat grayak (S. frugiperda) dan mengetahui konsentrasi yang dapat mematikan 50% ulat grayak (LC50). Metode yang digunakan untuk penelitian ini adalah metode Rancangan Acak Lengkap (RAL), ekstrak daun Belimbing wuluh dibuat dengan metode maserasi. Konsentrasi ekstrak yang digunakan 0%, 60%, 80%, dan 100%. Larva uji yang digunakan sebanyak 40 ekor. Parameter yang diamati adalah mortalitas dan kecepatan kematian. Hasil penelitian ini menunjukkan jumlah kematian ulat grayak adalah 66 ekor dari jumlah total larva 120 ekor. Hal ini membuktikan bahwa ekstrak daun Belimbing wuluh berpotensi sebagai insektisida alami terhadap ulat Grayak (S. frugiperda). Berdasarkan analisis probit konsentrasi yang efektif untuk membunuh 50% larva ulat grayak adalah 59,9%.
 Kata kunci : Belimbing wuluh (Averrhoa bilimbi L.), LC50, Mortalitas, Ulat Grayak (Spodoptera frugiperda)
","PeriodicalId":73099,"journal":{"name":"Frontiers in photonics","volume":"19 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-05-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135643373","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}

{"title":"Uji Karakteristik Elektrolit Ampas Kulit Nanas dengan Penambahan MgCl2, NaCl, dan KCl","authors":"Neneng Fitrya, Shabri Putra Wirman, Pakhriza Halwani","doi":"10.37859/jp.v13i2.4394","DOIUrl":"https://doi.org/10.37859/jp.v13i2.4394","url":null,"abstract":"Penelitian ini bertujuan untuk mengetahui karakteristik elektrolit ampas kulit nanas yang dimanfaatkan untuk pembuatan elektrolit pada bio-baterai sebagai sumber energi alternatif. Elektroda yang digunakan seng (Zn) dan tembaga (Cu). Parameter yang diukur yaitu tegangan, kuat arus dan lama nyala lampu LED. Variasi yang digunakan yaitu ampas kulit nanas murni, ampas kulit nanas dengan penambahan garam NaCl, KCl, MgCl2 dengan variasi massa 0,25, 0,50, 0,75, 1, 1,25 dan 1,50 gram. Hasil penelitian pasta kulit nanas yang ditambahkan garam menghasilkan tegangan dari 2,684 volt - 3,923 volt, kuat arus dari 0,52 mA – 0,79 mA dan nyala lampu LED dari 2 jam – 15 jam. Nilai tegangan pada nanas murni 2,517 volt dengan penambahan MgCl2 mengalami peningkatan tegangan 52,82%, nilai tegangan dengan penambahan NaCl mengalami peningkatan 55,83% dan nilai tegangan dengan penambahan KCl mengalami peningkatan 58,84%. Nilai kuat arus pada nanas murni 0,50 mA dengan penambahan MgCl2 mengalami peningkatan kuat arus 52,76%, nilai kuat arus dengan penambahan NaCl mengalami peningkatan 56,01% dan nilai kuat arus dengan penambahan KCl mengalami peningkatan 58,96%. Lama nyala lampu LED yang dihasilkan pada penambahan MgCl2, NaCl dan KCl yaitu 71,27%, 84,33%, dan 87,75% mengalami kenaikan waktu dari ampas kulit nanas murni. Hasil penelitian menunjukkan bahwa semakin besar penambahan massa garam pada ampas kulit nanas maka semakin besar hasil tegangan, kuat arus dan nyala lampu LED pada elektrolit. Pengujian ampas kulit nanas dapat menghasilkan energi listrik yang dapat dijadikan sebagai pembuatan elektrolit.","PeriodicalId":73099,"journal":{"name":"Frontiers in photonics","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-05-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135691878","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}

{"title":"Faktor-Faktor Yang Berhubungan dengan Pemanfaatan Program Pelayanan Lanjut Usia (Posyandu Lansia) di Wilayah Kerja Puskesmas Sawah Kabupaten Kampar","authors":"None Meldy Diani","doi":"10.37859/jp.v13i1.4133","DOIUrl":"https://doi.org/10.37859/jp.v13i1.4133","url":null,"abstract":"Abstrak
 Capaian pelaksanaan standar pelayanan minimal pada lansia di Kabupaten Kampar masih rendah dari 28.478 lansia, hanya 17.832 (62,6%) yang mendapatkan pelayanan kesehatan lansia. Pelaksanaan SPM Lansia di Puskesmas Sawah menduduki peringkat 4 terendah capaian SPM lansia dari 31 puskesmas yang ada di Kabupaten Kampar. Tujuan penelitian untuk mengetahui hubungan antara pengetahuan, sikap, dukungan keluarga, dan peran kader terhadap pemanfaatan program pelayanan Lansia. Jenis penelitan ini Kuantitatif dengan desain penelitian Analitik Cross Sectional. Sampel dalam penelitian berjumlah 143 orang. Pengumpulan data menggunakan kuesioner. Analisa data yang digunakan analisa univariat, bivariate dan multivariat. Hasil penelitian didapatkan bahwa ada hubungan antara pengetahuan, sikap, dukungan keluarga, dan peran kader terhadap Pemanfaatan Pelayanan Posyandu Lansia di Puskesmas Sawah Kabupaten Kampar. Dapat disimpulkan bahwa puskesmas harus meningkatkan promosi kesehatan berupa penyuluhan pentingnya pemanfaatan posyandu lansia dan melakukan advokasi kepada Tokoh Masyarakat (TOMA) untuk meningkatkan kunjungan posyandu lansia.
 Kata Kunci : Posyandu lansia, Program, Puskesmas Sawah
","PeriodicalId":73099,"journal":{"name":"Frontiers in photonics","volume":"53 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-05-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135691119","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}