{"title":"Multi-function digital THz-metasurfaces based on phase change materials","authors":"navid naghsh pour, Tavakol Pakizeh","doi":"10.1364/ome.522362","DOIUrl":"https://doi.org/10.1364/ome.522362","url":null,"abstract":"","PeriodicalId":19548,"journal":{"name":"Optical Materials Express","volume":null,"pages":null},"PeriodicalIF":2.8,"publicationDate":"2024-05-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141006400","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Laura Loi, Mathis Carpentier, Yannick Petit, Lionel Canioni
{"title":"First-order Type A waveguides Bragg gratings with under-diffraction-limited periodicities and sub-millimeter length for NIR applications","authors":"Laura Loi, Mathis Carpentier, Yannick Petit, Lionel Canioni","doi":"10.1364/ome.519762","DOIUrl":"https://doi.org/10.1364/ome.519762","url":null,"abstract":"","PeriodicalId":19548,"journal":{"name":"Optical Materials Express","volume":null,"pages":null},"PeriodicalIF":2.8,"publicationDate":"2024-05-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141022618","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Junxian Wang, Songgang Cai, Yucong Yang, Zixuan Wei, Tianchi Zhang, Wei Yan, Lei Bi
We report the local crystallization of Y3Fe5O12 (YIG) thin films grown on Si substrates, and SOI waveguides by CO2 laser annealing (LA). The effect of laser power and oxygen pressure on the crystal structure of YIG films was systematically studied. Laser power dominated the YIG film crystallinity, while oxygen partial pressure during LA strongly influenced the crystal grain size and magnetic anisotropy. Fully crystallized YIG thin films with pure garnet phases were fabricated by LA. The refractive index n and extinction coefficient k were comparable to thin films fabricated by rapid thermal annealing (RTA). Propagation loss measured at 1550 nm wavelength on YIG/SOI waveguides and YIG/SiN ring resonators were comparable to RTA annealed films, promising device development for silicon photonics.
我们报告了利用二氧化碳激光退火（LA）技术在硅衬底和 SOI 波导上生长的 Y3Fe5O12（YIG）薄膜的局部结晶情况。系统研究了激光功率和氧压对 YIG 薄膜晶体结构的影响。激光功率主导着 YIG 薄膜的结晶度，而 LA 过程中的氧分压则强烈影响着晶体晶粒尺寸和磁各向异性。通过 LA 技术制备出了具有纯石榴石相的全结晶 YIG 薄膜。折射率 n 和消光系数 k 与快速热退火（RTA）制备的薄膜相当。在波长为 1550 nm 的 YIG/SOI 波导和 YIG/SiN 环形谐振器上测量的传播损耗与 RTA 退火薄膜相当，有望用于硅光子器件的开发。
{"title":"Crystallization of Y3Fe5O12 thin films on silicon photonic waveguides using CO2 laser annealing","authors":"Junxian Wang, Songgang Cai, Yucong Yang, Zixuan Wei, Tianchi Zhang, Wei Yan, Lei Bi","doi":"10.1364/ome.523799","DOIUrl":"https://doi.org/10.1364/ome.523799","url":null,"abstract":"We report the local crystallization of Y<jats:sub>3</jats:sub>Fe<jats:sub>5</jats:sub>O<jats:sub>12</jats:sub> (YIG) thin films grown on Si substrates, and SOI waveguides by CO<jats:sub>2</jats:sub> laser annealing (LA). The effect of laser power and oxygen pressure on the crystal structure of YIG films was systematically studied. Laser power dominated the YIG film crystallinity, while oxygen partial pressure during LA strongly influenced the crystal grain size and magnetic anisotropy. Fully crystallized YIG thin films with pure garnet phases were fabricated by LA. The refractive index n and extinction coefficient k were comparable to thin films fabricated by rapid thermal annealing (RTA). Propagation loss measured at 1550 nm wavelength on YIG/SOI waveguides and YIG/SiN ring resonators were comparable to RTA annealed films, promising device development for silicon photonics.","PeriodicalId":19548,"journal":{"name":"Optical Materials Express","volume":null,"pages":null},"PeriodicalIF":2.8,"publicationDate":"2024-04-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141863675","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"High-performance photodetection based on black arsenic utilizing photoconductive effect","authors":"Tingqiu Yu, Shi Zhang, Huilin Wu, Jiayi Su","doi":"10.1364/ome.522882","DOIUrl":"https://doi.org/10.1364/ome.522882","url":null,"abstract":"","PeriodicalId":19548,"journal":{"name":"Optical Materials Express","volume":null,"pages":null},"PeriodicalIF":2.8,"publicationDate":"2024-04-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140659460","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Zhigang Chen, M. Khajavikhan, Guoqing Chang, Alessia Pasquazi, Anna Peacock
: This joint issue of Optics Express and Optical Materials Express features 18 state-of-the art articles that witness actual developments in nonlinear optics, including those by authors who participated in the international conference Nonlinear Optics held in Waikoloa, Hawaii from July 15 to 19, 2019. As an introduction, the editors provide a summary of these articles that cover all aspects of nonlinear optics, from basic nonlinear effects and novel frequency windows to innovative nonlinear materials and devices, thereby paving the way for new nonlinear optical concepts and forthcoming applications. (NLO)
{"title":"Nonlinear Optics: Feature Issue Introduction","authors":"Zhigang Chen, M. Khajavikhan, Guoqing Chang, Alessia Pasquazi, Anna Peacock","doi":"10.1364/ome.528500","DOIUrl":"https://doi.org/10.1364/ome.528500","url":null,"abstract":": This joint issue of Optics Express and Optical Materials Express features 18 state-of-the art articles that witness actual developments in nonlinear optics, including those by authors who participated in the international conference Nonlinear Optics held in Waikoloa, Hawaii from July 15 to 19, 2019. As an introduction, the editors provide a summary of these articles that cover all aspects of nonlinear optics, from basic nonlinear effects and novel frequency windows to innovative nonlinear materials and devices, thereby paving the way for new nonlinear optical concepts and forthcoming applications. (NLO)","PeriodicalId":19548,"journal":{"name":"Optical Materials Express","volume":null,"pages":null},"PeriodicalIF":2.8,"publicationDate":"2024-04-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140665240","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Brian Topper, Alexander Neumann, Stephen K. Wilke, Randall E. Youngman, Abdulrahman Alrubkhi, and Richard Weber
Erbium lanthanum titanate glasses were prepared by levitation melting for the spectroscopic study of ways to promote the mid-infrared fluorescence. Two series of heavily erbium doped glasses (15 wt%) were prepared with the addition of either Pr3+ or Nd3+ in amounts relative to Er3+ of 0.05, 0.1, and 0.2. Both ions quench the lower Er3+ laser level with the Pr3+ doing so more rapidly. Although high co-dopant concentrations result in higher energy transfer, as clearly evidenced in upconversion and downconversion fluorescence measurements, the mid-infrared lifetime also suffers a reduction and, therefore, a balance must be struck in the co-dopant concentration. Lifetime and spectral measurements indicate that, at a fixed relative co-dopant amount, Pr3+ is more effective than Nd3+ at removing the bottleneck of the Er3+4I13/2 level. Moreover, consideration of the lifetimes alongside the absorption data of the individual ions indicates that despite the large absorption cross-section of Nd3+ at 808 nm, the concentration needed to yield more absorbed power than utilizing direct 976 nm excitation of Er3+ results in unfavorable lifetimes of the mid-infrared transition. In the end, Pr3+ prevails as the superior co-dopant in terms of the effects on fluorescence lifetimes as well as potential laser system design considerations. In a unique self-doping approach, a reducing melt atmosphere of Ar instead of O2 creates a small fraction of Ti3+. In 5Er2O3-12La2O3-83TiO2 glass, the presence of Ti3+ quenches the 4I13/2 emission about 2.6 times more than the 4I11/2 when lifetimes are compared to an O2 melt environment. As an additional means of increasing the mid-infrared emission, the effect of temperature on the mid- and near- infrared lifetimes of a lightly doped lanthanum titanate composition is investigated between 77-300 K. The mid-infrared lifetime increases by ∼30% while the near-infrared lifetime increases by ∼10%, which suggests in addition to co-doping, active cooling of the gain media will further enhance performance.
{"title":"Comparing Pr3+ and Nd3+ for deactivating the Er3+: 4I13/2 level in lanthanum titanate glass","authors":"Brian Topper, Alexander Neumann, Stephen K. Wilke, Randall E. Youngman, Abdulrahman Alrubkhi, and Richard Weber","doi":"10.1364/ome.517790","DOIUrl":"https://doi.org/10.1364/ome.517790","url":null,"abstract":"Erbium lanthanum titanate glasses were prepared by levitation melting for the spectroscopic study of ways to promote the mid-infrared fluorescence. Two series of heavily erbium doped glasses (15 wt%) were prepared with the addition of either Pr<sup>3+</sup> or Nd<sup>3+</sup> in amounts relative to Er<sup>3+</sup> of 0.05, 0.1, and 0.2. Both ions quench the lower Er<sup>3+</sup> laser level with the Pr<sup>3+</sup> doing so more rapidly. Although high co-dopant concentrations result in higher energy transfer, as clearly evidenced in upconversion and downconversion fluorescence measurements, the mid-infrared lifetime also suffers a reduction and, therefore, a balance must be struck in the co-dopant concentration. Lifetime and spectral measurements indicate that, at a fixed relative co-dopant amount, Pr<sup>3+</sup> is more effective than Nd<sup>3+</sup> at removing the bottleneck of the Er<sup>3+</sup> <sup>4</sup><i>I</i><sub>13/2</sub> level. Moreover, consideration of the lifetimes alongside the absorption data of the individual ions indicates that despite the large absorption cross-section of Nd<sup>3+</sup> at 808 nm, the concentration needed to yield more absorbed power than utilizing direct 976 nm excitation of Er<sup>3+</sup> results in unfavorable lifetimes of the mid-infrared transition. In the end, Pr<sup>3+</sup> prevails as the superior co-dopant in terms of the effects on fluorescence lifetimes as well as potential laser system design considerations. In a unique self-doping approach, a reducing melt atmosphere of Ar instead of O<sub>2</sub> creates a small fraction of Ti<sup>3+</sup>. In 5Er<sub>2</sub>O<sub>3</sub>-12La<sub>2</sub>O<sub>3</sub>-83TiO<sub>2</sub> glass, the presence of Ti<sup>3+</sup> quenches the <sup>4</sup><i>I</i><sub>13/2</sub> emission about 2.6 times more than the <sup>4</sup><i>I</i><sub>11/2</sub> when lifetimes are compared to an O<sub>2</sub> melt environment. As an additional means of increasing the mid-infrared emission, the effect of temperature on the mid- and near- infrared lifetimes of a lightly doped lanthanum titanate composition is investigated between 77-300 K. The mid-infrared lifetime increases by ∼30% while the near-infrared lifetime increases by ∼10%, which suggests in addition to co-doping, active cooling of the gain media will further enhance performance.","PeriodicalId":19548,"journal":{"name":"Optical Materials Express","volume":null,"pages":null},"PeriodicalIF":2.8,"publicationDate":"2024-04-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140623957","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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