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  • Home
  • Members
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  • Events
    • Lectures >
      • Industry Perspective Lectures
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    • Women in Photonics Week >
      • WIPW 2019
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    • Light Science Workshop >
      • Light Science 2018
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      • Day of Light 2019
      • 2015 Symposium
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    • QIS >
      • QIS2022
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  • Education
    • Education Home
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      • Light-Pipes: Controlling Light
      • DIY Holograms
      • Color Mixing
      • LaserComm
      • Fluorescence
    • Classes
    • Outreach Events
    • Outreach Kits 2020
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Breaking the Bounds of Imaging in Label-Free Nanoscopy, Micro-Endoscopy and Ophthalmology - Dr. Zalevsky

1/26/2021

 
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​Dr. Zeev Zalevsky
Professor of Electrical Engineering
​​Bar-Ilan University
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Thursday, February 25th, 10 am (PST) via Zoom
Meeting ID: 854 2977 2482  Passcode: 230903
Both human vision and imaging systems have limited capability to separate spatial features, and this information can only be extracted from a limited range in depth. These limitations arise from diffraction, i.e., the finite dimensions of the imaging optics and the geometry of the sensor. In this talk, I will present novel photonic approaches to exceed the resolution limitations of geometric optics. I will show how those concepts can be adapted to micro endoscopy as well as to microscopy-related configurations, including ophthalmic devices for correcting visual deficiencies.
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Images from https://doi.org/10.1117/3.2514861
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From Dr. Zalevsky's talk -- an introduction to noise equivalent resolution

Infrared Applications for Safe and Healthy Living - Dr. Perera

1/26/2021

 
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​​Dr. Unil Perera
Regents’ Professor of Physics
Georgia State University


Friday, January 29th, 10 am (PST) 
​Infrared detectors and imaging systems are becoming increasingly important in a diverse range of astronomic, military, and civilian applications. This field has gained significant attention while incorporating various materials and architectures into detector designs with a strong focus on applicability into clinical domains. Dr. Perera will discuss recent detector structures, and his latest work on disease detection. Biomedical applications of infrared include an exploration of an Affordable, Sensitive, Specific, User-friendly, Rapid, Equipment-free, and Deliverable (ASSURED) diagnostic regimen and testing its clinical feasibility for inflammatory bowel diseases (IBDs) and cancer screening. A study using Fourier transform infrared (FTIR) spectroscopy in attenuated total reflectance (ATR) sampling mode analyzed  body fluids in order to identify reproducible,  stable,  and statistically significant differences  in spectral signatures of the IR absorbance spectra between the control and disease samples. These results show that serum samples can be used to detect the biochemical changes induced by these diseases. 
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Image from https://doi.org/10.1038/s41598-017-17027-4
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Image from https://doi.org/10.1038/s41598-017-17027-4
​Student’s t-test (two-tailed unequal variance) p-values of absorbance. Discriminatory region for lymphoma with higher significance (p < 0.05) are amide I of protein, amide II of protein, C-H bends of CH3/CH2 groups in α- and β- anomers, asymmetric phosphate I, and carbohydrates with predominant contributions nucleic acids (DNA/RNA via PO2 − stretches). Discriminatory regions of melanoma are amide I and carbohydrates with predominant contributions of nucleic acids.
Plots of the protein secondary structures (α-helix, β-sheet) and their ratio. (a) Quantified integral (area covered) values of α-helix components are less for tumorous cases compared to control. (b) Integral values of β-sheet components are higher for tumorous cases compared to control

Student Lecture Series - January 22, 2021

1/20/2021

 
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1:00 PM Friday, January 22nd
Zoom Meeting --– Meeting ID: 847 3105 9791 --- Password: 792878  --- Zoom Link


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Yahya Mohtashami
​Schuller group
ECE
Dept, UCSB



​Light-Emitting
Metasurfaces

In this talk, we show that we can increase the light extraction efficiency of, impart directionality upon, collimate, and focus the spontaneous emission from InGaN/GaN quantum wells, using phased-array metasurfaces.

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Seamus O’Hara
Sherwin group
Physics
Dept, UCSB



​Optical Sensitivity to Wavefunctions of Electron-Hole Pairs in Semiconductors
​

Strong THz laser fields can explore non-linear, non-equilibrium phenomena in matter. The talk will focus on photons emitted by electron/hole re-collisions, and how the polarization of these photons carries information about the semiconductor.

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