@article{Lopez-Garcia2022,
title = {Versatile chip-based nanoscopy becomes ready for histopathology assessment},
author = {Martin Lopez-Garcia},
doi = {10.1038/s41377-022-00781-0},
year = {2022},
date = {2022-04-23},
journal = {LIGHT-SCIENCE & APPLICATIONS},
volume = {11 (1)},
number = {87},
abstract = {Nanoscopy is a mature technology used routinely in life science to obtain images well below the optical diffraction limit. But the use of nanoscopy in histopathology assessment is very limited mostly due to the low throughput of traditional nanoscopic techniques. So far, Chip-nanoscopy, nanoscopy in which sample illumination is performed by an integrated photonic chip instead of bulk optics, has been shown to provide an enhanced field of view and throughput for cell biology. Now, a new development shows that chip-nanoscopy also offers interesting progress for the study of histological samples offering a complementary technique to electron microscopy for histopathology assessment.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}

@article{Castillo2022,
title = {Light-Dependent Morphological Changes Can Tune Light Absorption in Iridescent Plant Chloroplasts: A Numerical Study Using Biologically Realistic Data},
author = {Miguel A. Castillo, William P. Wardley, and Martin Lopez-Garcia},
url = {https://doi.org/10.1021/acsphotonics.0c01600},
doi = {10.1021/acsphotonics.0c01600},
year = {2022},
date = {2022-02-20},
journal = {ACS PHOTONICS},
volume = {8},
number = {12},
pages = {3651-3651},
abstract = {In higher plants and algae, chloroplasts are the organelle responsible for photosynthesis. Previous work has focused mostly on the role of the photosynthetic pigments; however, recent advances demonstrated that light interactions within chloroplasts could make use of intrinsic nanophotonic properties to manipulate light to enhance light-harvesting efficiency. We hypothesize that the documented morphological changes undergone by chloroplasts under varying light conditions can highly influence the light-harvesting properties due to nanophotonic effects. In this work, we focused on a type of specialized chloroplast known as the iridoplast, which has intrinsic photonic crystal properties such as strong reflectance and slow light effects. We studied how the photonic properties of iridoplasts are affected by light-induced dynamic changes using realistic data extracted from previous reports. The results show a reflectance red-shift from blue to green under increasing light intensity. Consequently, the light absorption enhancement induced by slow light is also red-shifted. We also showed that the photonic properties are resilient to biologically realistic levels of disorder in the structure. We extended this analysis to another photonic nanostructure-containing chloroplast, known as a bizonoplast, and found similar results, pointing toward similar properties in different plant species. We finally demonstrated that all types of chloroplasts can tune light absorption depending on light conditions. In general, our study opens the door to understanding how dynamic morphological changes in chloroplasts can affect light scattering and absorption.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}

@article{Lopez-Garcia2018,
title = {Light-induced dynamic structural color by intracelullar 3D photonic crystals in brown algae},
author = {O’Brien Lennon Atkinson Cryan Oulton Whitney H E J G M J R H M M. Lopez-Garcia N. Masters},
url = {http://advances.sciencemag.org/content/4/4/eaan8917},
doi = {DOI: 10.1126/sciadv.aan8917},
year = {2018},
date = {2018-04-11},
journal = {Science Advances},
abstract = {Natural photonic crystals are responsible for strong reflectance at selective wavelengths in different natural systems. We demonstrate that intracellular opal-like photonic crystals formed from lipids within photosynthetic cells produce vivid structural color in the alga Cystoseira tamariscifolia. The reflectance of the opaline vesicles is dynamically responsive to environmental illumination. The structural color is present in low light–adapted samples, whereas higher light levels produce a slow disappearance of the structural color such that it eventually vanishes completely. Once returned to low-light conditions, the color re-emerges. Our results suggest that these complex intracellular natural photonic crystals are responsive to environmental conditions, changing their packing structure reversibly, and have the potential to manipulate light for roles beyond visual signaling.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}

@article{Chen2017,
title = {Direct wide-angle measurement of a photonic band structure in a three-dimensional photonic crystal using infrared Fourier imaging spectroscopy},
author = {PC Taverne Zheng Ho Rarity M X Y-L D J G L. Chen M. Lopez-Garcia},
url = {https://www.osapublishing.org/ol/abstract.cfm?uri=ol-42-8-1584},
doi = {https://doi.org/10.1364/OL.42.001584},
year = {2017},
date = {2017-04-11},
journal = {Optics Letters},
abstract = {We propose a method to directly visualize the photonic band-structure of micrometer-sized photonic crystals using wide-angle spectroscopy. By extending Fourier imaging spectroscopy sensitivity into the infrared range, we have obtained accurate measurements of the band structures along the high-symmetry directions (X-W-K-L-U) of polymeric three-dimensional, rod-connected diamond photonic crystals. Our implementation also allows us to record single-wavelength reflectance far-field patterns showing very good agreement with simulations of the same designs. This technique is suitable for the characterization of photonic structures working in the infrared and, in particular, to obtain band-structure information of complete photonic band gap materials.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}

@article{Jacobs2016,
title = {Photonic multilayer structure of Begonia chloroplasts enhances photosynthetic efficiency},
author = {Phrathep T.Lawson Oulton Whitney O-P R H M. Jacobs M. Lopez-Garcia},
url = {https://www.nature.com/articles/nplants2016162},
doi = {doi:10.1038/nplants.2016.162},
year = {2016},
date = {2016-10-24},
journal = {Nature Plants},
abstract = {Enhanced light harvesting is an area of interest for optimizing both natural photosynthesis and artificial solar energy capture1,2. Iridescence has been shown to exist widely and in diverse forms in plants and other photosynthetic organisms and symbioses3,4, but there has yet to be any direct link demonstrated between iridescence and photosynthesis. Here we show that epidermal chloroplasts, also known as iridoplasts, in shade-dwelling species of Begonia5, notable for their brilliant blue iridescence, have a photonic crystal structure formed from a periodic arrangement of the light-absorbing thylakoid tissue itself. This structure enhances photosynthesis in two ways: by increasing light capture at the predominantly green wavelengths available in shade conditions, and by directly enhancing quantum yield by 5–10% under low-light conditions. These findings together imply that the iridoplast is a highly modified chloroplast structure adapted to make best use of the extremely low-light conditions in the tropical forest understorey in which it is found5,6. A phylogenetically diverse range of shade-dwelling plant species has been found to produce similarly structured chloroplasts7,​8,​9, suggesting that the ability to produce chloroplasts whose membranes are organized as a multilayer with photonic properties may be widespread. In fact, given the well-established diversity and plasticity of chloroplasts10,11, our results imply that photonic effects may be important even in plants that do not show any obvious signs of iridescence to the naked eye but where a highly ordered chloroplast structure may present a clear blue reflectance at the microscale. Chloroplasts are generally thought of as purely photochemical; we suggest that one should also think of them as a photonic structure with a complex interplay between control of light propagation, light capture and photochemistry},
keywords = {},
pubstate = {published},
tppubtype = {article}
}

@article{Nuñez-Sanchez2016,
title = {Excitonic Optical Tamm States: A Step toward a Full Molecular–Dielectric Photonic Integration},
author = {Murshidy Abdel-Hady Serry Adawi Rarity Oulton Barnes M M A G M Y A M J G R W L S. Nuñez-Sanchez M. Lopez-Garcia},
url = {https://pubs.acs.org/doi/abs/10.1021/acsphotonics.6b00060},
doi = {DOI: 10.1021/acsphotonics.6b00060},
year = {2016},
date = {2016-05-18},
journal = {ACS Photonics},
abstract = {We report the first experimental observation of an excitonic optical Tamm state supported at the interface between a periodic multilayer dielectric structure and an organic dye-doped polymer layer. The existence of such states is enabled by the metal-like optical properties of the excitonic layer based on aggregated dye molecules. Experimentally determined dispersion curves, together with simulated data, including field profiles, allow us to identify the nature of these new modes. Our results demonstrate the potential of organic excitonic materials as a powerful means to control light at the nanoscale, offering the prospect of a new alternative photonic building block for nanophotonics designs based on molecular materials.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}

@article{Zou2014,
title = {Spectral and Angular Characteristics of Dielectric Resonator Metasurface at Optical Frequencies},
author = {Withayachumnankul Shah Mitchell Bhaskaran Sriram R.Oulton Klemm Fumeaux W C M A M S M C L. Zou M. Lopez-Garcia},
url = {https://aip.scitation.org/doi/full/10.1063/1.4901735},
doi = {https://doi.org/10.1063/1.4901735},
year = {2014},
date = {2014-11-15},
journal = {Applied Physics Letters},
abstract = {The capability of manipulating light at subwavelength scale has fostered the applications of flat metasurfaces in various fields. Compared to metallic structure, metasurfaces made of high permittivity low-loss dielectric resonators hold the promise of high efficiency by avoiding high conductive losses of metals at optical frequencies. This letter investigates the spectral and angular characteristics of a dielectric resonator metasurface composed of periodic sub-arrays of resonators with a linearly varying phase response. The far-field response of the metasurface can be decomposed into the response of a single grating element (sub-array) and the grating arrangement response. The analysis also reveals that coupling between resonators has a non-negligible impact on the angular response. Over a wide wavelength range, the simulated and measured angular characteristics of the metasurface provide a definite illustration of how different grating diffraction orders can be selectively suppressed or enhanced through antenna sub-array design.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}

@article{Lopez-Garcia2014,
title = {Efficient Out-coupling and Beaming of Tamm Optical States via Surface Plasmon Polariton Excitation},
author = {Taverne Chen Murshidy Edwards Serry Adawi Rarity Oulton M P C L M M A P M Y A M J G R M. Lopez-Garcia Y. D. Ho},
url = {https://aip.scitation.org/doi/full/10.1063/1.4882180},
doi = {https://doi.org/10.1063/1.4882180},
year = {2014},
date = {2014-05-15},
journal = {Applied Physics Letters},
abstract = {We present evidence of optical Tamm states to surface plasmon polariton (SPP) coupling. We experimentally demonstrate that for a Bragg stack with a thin metal layer on the surface, hybrid Tamm-SPP modes may be excited when a grating on the air-metal interface is introduced. Out-coupling via the grating to free space propagation is shown to enhance the transmission as well as the directionality and polarization selection for the transmitted beam. We suggest that this system will be useful on those devices, where a metallic electrical contact as well as beaming and polarization control is needed.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}