Nanophotonics and its applications
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Transcript of Nanophotonics and its applications
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NANO PHOTONICS AND ITS APPLICATIONS
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What is Nano Photonics?
“Nanophotonics is the study of the behavior of light on the nanometer scale, and of the interaction of nanometer-scale objects with light.”
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Introduction to Nano Photonics
The term "Nano-photonics", just like the term "optics", usually concern ultraviolet, visible, and near -infrared light (free-space wavelength around 300-1200 nanometers).
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Normal optical components, like lenses and microscopes cannot focus light to nanometer scale.
But, it is possible to squeeze light into a nanometer scale using other techniques like
Surface plasmons Metal optics Near field optics Metamaterials
Principles
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Surface Plasmons Surface plasmon waves possess the ability to confine optical energy to subwavelength volumes. This attractive feature has encouraged and led to research, developments and new device opportunities in numerous areas of science, including Nano photonics.
Surface plasmons guide light to nanoscale Plasmonic effect
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Metal opticsMetals are an effective way to confine light
to far below the wavelength. For a similar reason, visible light can be confined to the Nano-scale via Nano-sized metal structures, such as Nano-sized structures, tips, gaps, etc. This effect is fundamentally based on the fact that the permittivity of the metal is very high.
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Near field opticsThe higher frequencies correspond to the very
fine features and sharp edges. When light is emitted by such an object, the light with very high spatial frequency forms an evanescent wave, which only exists in the near field and disappears in the far field. Nano-photonics is primarily concerned with the near-field evanescent waves.
Tip illuminates the sample
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Nano Photonics In Nature !
Nano photonics in butterfly wings
Butterfly wings as natural photonic crystal, assembly of CdS nanoparticles
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Nano photonics in peacock feathers
Peacock feathers as nano photonic crystal, assembly of ZnS nanoparticles
Nano photonics in photoreceptor rhodopsin
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Advantages Of Nano Photonics
Some of the advantages of Nano Photonics are, Brings access to further integration Lower noise Will dissipate less energy Will occupy less volume Will require lower input signal Will probably rely on self-assembly
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Applications Of Nano Photonics
Nano photonics in solar cells
Nano photonics allow efficient solar cells to be made cheaper than the conventional one.
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As band-gap materials, In high dense data storage, and photonic devices
Large-area of photonic nanostructures is fabricated by photolithography.
Ferro- electronic nano structures
5D discs with a storage capacity 2,000 times that of DVDs with nano structured material incorporated onto a disc in order to increase data capacity
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Microscopy
The goal of Nano photonics, "superlens" which would use metamaterials or other techniques to create images that are more accurate than the diffraction limit.
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The detection of traces and ultra-traces of toxic and harmful compounds in air by using networks of small sensors like MEMS (Micro Electro Mechanical Systems) or Lab-on-Chip devices.
Nano Photonic Biosensors
Lab on a chip MEMS
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In medicine and biology, DNA assisted assembly of metal nanoparticles.
In Medicine And Biology
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Presented By,K.A.Sakthi Krishna Bala,Dr.Sivanthi Aditanar College of
Engineering,Tiruchendur.