26-11-2012, 02:53 PM
Biophotonics and Photonic Crystal Fibers (PCF)
Biophotonics and Photonic.ppt (Size: 2.53 MB / Downloads: 65)
What is Photonics?
Photonics is the technology that deals with the transmission, control, and detection of light (photons)
- It is also called fiber optics, lightwave technology and optoelectronics
Photons serve as the basic unit in photonics, just as electrons are the basic unit in electronics
Motivation of Biophotonics
There is a rapidly growing use of photonic devices for biomedical diagnosis, therapy, and imaging, and for life sciences research
Light delivery and collection procedures present challenges in biophotonic systems
The unique physical and light transmission properties of optical fiber-based photonic components help solve these challenges
Passive and active optical components used in telecom lightwave equipments are of special interest for biophotonics
Goals of Biophotonics
How to use photonics in biological systems
- Optical fibers, light sources, photodetectors
- The principles describing the interaction of
light with biological matter (cells, tissues, fluids)
How to apply photonic devices to healthcare
This knowledge will serve as an introduction
to engineering opportunities in biophotonics
Optical fibers in biophotonic systems
Optical fibers have an important role in biophotonic
systems
Deliver light to a small precise area
- Therapeutic healthcare sessions
- Diagnosis of a treatment area
- A wide range of power levels are needed
Gather a low level of light from a molecule or a tissue specimen
Transport the light to a photodetector
Used in optical fiber sensor systems
- Monitoring human health conditions
- Monitoring environmental conditions
Examples of Biophotonic applications
Endoscopy: Involves simultaneous light-delivery and image-collection processes via fibers
Spectroscopic analysis: Collect and analyze both scattered light and naturally occurring fluorescence being emitted from the tissue
Biosensing: Analyze the presence, concentration, and characteristics of biological material
Light therapy: Eg., photodynamic therapy
Laser microsurgery: Eg., use within a blood vessel for interventional surgery of life-threatening blood clots
Light sources for Biophotonics
Reasons for using specific sources
- The wavelength must match the material’s light
absorption or scattering properties
- Lasers and LEDs can emit in the UV, visible or IR
spectral regions
- Diagnostics, therapy, surgery, cosmetics and basic
science research each require a variety of different
light properties
- An important issue in biophotonics is the intensity
and duration of the light exposure for a particular
application
LED Anti-Aging Light Therapy
Uses panels or arrays of red and/or infrared light that delivers low-level pulses of light up to three times brighter than the sun to activate skin cells
Some cosmetic benefits
- Minimizes fine lines, wrinkles,
crow’s feet
- Restores skin’s natural
collagen production
- Reduces melanin that causes brown spots
- Reduces the effects of sun-damaged skin
- Increases circulation and moisture
- Reduces skin degradation and redness