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Home Sensors Surface Plasmon Resonance Spectrometer Plasmon - 6

Surface Plasmon Resonance Spectrometer Plasmon - 6


The PLASMON-6 is a computer-controlled surface plasmon resonance (SPR) spectrometer that implements the Kretschmann prism arrangement. A 45 nm film of gold is deposited onto a glass slide which is brought into optical contact with the prism using refractive index matching fluid. This gold film forms the sensor surface where the surface plasmons are excited using a polarized light emitted by a semiconductor laser (l=670nm). The laser light is launched into the rotating ATR prism where it can couple with the surface mode to yield the surface plasmons. Excitation of plasmons is evidenced by a resonant dip in the reflectance of the gold film under the correct coupling conditions.

The angular dependence of this intensity (the resonance curve) reflects variation of the SPR coupling level and represents the sensor output. Its shape, especially position of the resonant dip, allows for the refractive index and the thickness of the layer coated upon the gold film to be elucidated. Surface plasmons are confined to the plane of the gold film, producing evanescent electromagnetic field. It extends over ~1 μm from the surface that makes this technique essentially surface-sensitive.

Depend on modification device has one or two optical channels. Second channel can be used as measuring or reference. Modification of the instrument destined for electrochemical applications features additional ADC input and software means for recording of voltamperograms simultaneously with the optical signal.

Surface Plasmon Resonance Spectrometer Plasmon - 6
Fig. 1 Surface Plasmon Resonance Spectrometer Plasmon - 6

Innovative Aspect and Main Advantages

Surface plasmon resonance is a unique optical surface sensing technique that is responsive to refractive index changes that occur within the vicinity of a sensor surface. Thus, surface plasmon resonance can be used to monitor any physical phenomenon which alters the refractive index at the surface and has grown into a versatile technique used in variety of applications. Of special interest is its potential for biosensing techniques.

Areas of Application

  • Veterinary medicine;
  • Medicine;
  • Biotechnology;
  • Food industry;
  • Ecological monitoring;
  • Customs supervision.

The most used applications:

  • Realization of real time biokinetic, immunosensing and biosensing techniques;
  • Studies of adsorption, corrosion, electrochemical reactions;
  • Thin organic and inorganic film characterization and refractive index measurements;
  • Gas and liquid composition detection and chemosensor applications.

Stage of Development

Pilot samples.

Contact Details

Contact persons: Yu.V. Ushenin, A.V. Samoylov
V. Lashkaryov Institute of Semiconductors Physics of the National Academy of Sciences of Ukraine
Address: 41, Prospect Nauki, 03028, Kiev, Ukraine
(+38 044) 525 3123, 525 5743
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