Reflectance Spectroscopy Lab. Different colors correspond to different wavelengths of visible light...

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Reflectance Spectroscopy Lab

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Transcript of Reflectance Spectroscopy Lab. Different colors correspond to different wavelengths of visible light...

Page 1: Reflectance Spectroscopy Lab. Different colors correspond to different wavelengths of visible light 665 nm 630 nm 600 nm 550 nm 470 nm 425 nm 400 nm.

Reflectance Spectroscopy Lab

Page 2: Reflectance Spectroscopy Lab. Different colors correspond to different wavelengths of visible light 665 nm 630 nm 600 nm 550 nm 470 nm 425 nm 400 nm.

Different colors correspond to different wavelengths of visible light

665 nm

630 nm

600 nm

550 nm

470 nm

425 nm

400 nm

Page 3: Reflectance Spectroscopy Lab. Different colors correspond to different wavelengths of visible light 665 nm 630 nm 600 nm 550 nm 470 nm 425 nm 400 nm.

Today’s Lab• If we shine light on an object, some light is

absorbed and some is reflected

• Which wavelengths/colors are absorbed versus reflected?

Page 4: Reflectance Spectroscopy Lab. Different colors correspond to different wavelengths of visible light 665 nm 630 nm 600 nm 550 nm 470 nm 425 nm 400 nm.

Incoming white light

(all colors)

Page 5: Reflectance Spectroscopy Lab. Different colors correspond to different wavelengths of visible light 665 nm 630 nm 600 nm 550 nm 470 nm 425 nm 400 nm.

White paper

Incoming white light

(all colors)

Page 6: Reflectance Spectroscopy Lab. Different colors correspond to different wavelengths of visible light 665 nm 630 nm 600 nm 550 nm 470 nm 425 nm 400 nm.

White paper

White paper reflects all

wavelengths

Incoming white light

(all colors)

Page 7: Reflectance Spectroscopy Lab. Different colors correspond to different wavelengths of visible light 665 nm 630 nm 600 nm 550 nm 470 nm 425 nm 400 nm.

Black Paper

Incoming white light

(all colors)

Absorbs all wavelengths

Page 8: Reflectance Spectroscopy Lab. Different colors correspond to different wavelengths of visible light 665 nm 630 nm 600 nm 550 nm 470 nm 425 nm 400 nm.

Green PaperReflects green

light

Incoming white light

(all colors)

Absorbs other colors

Page 9: Reflectance Spectroscopy Lab. Different colors correspond to different wavelengths of visible light 665 nm 630 nm 600 nm 550 nm 470 nm 425 nm 400 nm.

Objects appear to be different colors because of the light they reflect

Page 10: Reflectance Spectroscopy Lab. Different colors correspond to different wavelengths of visible light 665 nm 630 nm 600 nm 550 nm 470 nm 425 nm 400 nm.

Reflected light versus emitted light

Page 11: Reflectance Spectroscopy Lab. Different colors correspond to different wavelengths of visible light 665 nm 630 nm 600 nm 550 nm 470 nm 425 nm 400 nm.

Reflected light versus emitted light

Page 12: Reflectance Spectroscopy Lab. Different colors correspond to different wavelengths of visible light 665 nm 630 nm 600 nm 550 nm 470 nm 425 nm 400 nm.

Reflected light versus emitted lightToday’s Lab

Page 13: Reflectance Spectroscopy Lab. Different colors correspond to different wavelengths of visible light 665 nm 630 nm 600 nm 550 nm 470 nm 425 nm 400 nm.

Spectrum: a plot that shows how reflected light from an object varies with wavelength

Page 14: Reflectance Spectroscopy Lab. Different colors correspond to different wavelengths of visible light 665 nm 630 nm 600 nm 550 nm 470 nm 425 nm 400 nm.

Spectrum: a plot that shows how reflected light from an object varies with wavelength

Page 15: Reflectance Spectroscopy Lab. Different colors correspond to different wavelengths of visible light 665 nm 630 nm 600 nm 550 nm 470 nm 425 nm 400 nm.

Different objects have unique spectra

Page 16: Reflectance Spectroscopy Lab. Different colors correspond to different wavelengths of visible light 665 nm 630 nm 600 nm 550 nm 470 nm 425 nm 400 nm.

Reflectance Spectrometer

Shines a single wavelength of light on an object and measures intensity of reflected light

Page 17: Reflectance Spectroscopy Lab. Different colors correspond to different wavelengths of visible light 665 nm 630 nm 600 nm 550 nm 470 nm 425 nm 400 nm.

Reflectance Spectrometer

Has 2 infrared channels

Page 18: Reflectance Spectroscopy Lab. Different colors correspond to different wavelengths of visible light 665 nm 630 nm 600 nm 550 nm 470 nm 425 nm 400 nm.

Infrared light has longer wavelength than red light

Can think of infrared energy as the heat an object emits• Humans emit infrared energy• Planets emit infrared energy


Polarization-Insensitive Metalenses at Visible Wavelengths planar lenses (metalenses) at red, green, and blue wavelengths (λ = 660, 532, and 405 nm). Metalenses with numerical apertures

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1 Light. 2 Visible Light Wavelengths range from 400 nm to 700 nm Longest wavelength = red Shortest wavelength = violet 1 nm = 1 x 10 -9 m.

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