Biophotonics_Concepts_to_Applications
Solution: From Eq. (5.7) the long-wavelength cutoff is g¼ number of electronhole pairs generated number of incident absorbed ph ...
Example 5.6 (a) The quantum efficiency for InGaAs is around 90 % for the wavelength range 1300 nm <λ< 1600 nm. Show that i ...
(d) At wavelengths less than 1100 nm, the photons are absorbed very close to the photodetector surface, where the recombination ...
The multiplication M for all carriers generated in the photodiode is defined by M¼ iM ip ð 5 : 9 Þ where iMis the average value ...
maintained for proper signal interpretation. The powersignal-to-noise ratio(des- ignated by SNR) at the output of an optical rec ...
statistics follow a Poisson process. Because thefluctuations in the number of photocarriers created are a fundamental property o ...
(c) The mean-square dark current noise; and (d) The mean-square thermal noise current. Solution: (a) From Eq. (5.8) the primary ...
referred to as thenoise equivalent poweror NEP, which is designated in units of W/ ffiffiffiffiffiffi Hz p . As an example, cons ...
5.4 Multichannel Detectors Only one spectral channel can be monitored at any instance in time with a single-channel photodetecti ...
and a charge transfer register situated under another opaque gate. During device operation the light-sensing portion is biased t ...
conversion and amplification circuitry consisting of four metal-oxide-semiconductor field-effect transistors (MOSFETs) plus a ju ...
activating M4. The resulting output current is related to the capacitor voltage, which is a measure of the light intensity. The ...
Photocathodes can be configured to operate in either a reflection mode or a transmission mode. Areflection mode photocathodeusua ...
5.6 Optical Filters Opticalfiltersare devices that selectively transmit light in one or more specific bands of wavelengths while ...
reflecting) adjacent wavelengths over extended spectral ranges. The wavelength bandwidth often is described in terms of thefull- ...
commonly is referred to as adichroic mirror,beam splitter,orbeam combiner. Typically a dichroic mirror is placed at a 45° angle ...
greenfilter passes 505±15 nm, and a redfilter passes 610±15 nm. In the near-IR region, thin-filmfilters are available in a wide ...
Anoptical circulatoris a non-reciprocal multi-port passive device that directs light sequentially from port to port in only one ...
parameters for commercial 3-port and 4-port optical circulators. In the biophotonics field this device is used in conjunction wi ...
G(x)¼U 0 asexpðasxÞ HereΦ 0 is the incident photonflux per unit area given by U 0 ¼ Pinð 1 RfÞ Ahm where A is the detector are ...
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