Energy Unit Conversions


As the field of nanophotonics continues to become more interdisciplinary, it is essential to be able to convert between different units of energy by memory.  When reading papers, attending talks, having conversations with colleagues, and answering questions in your own presentations, you should always know exactly where a certain measurement lies in the electromagnetic spectrum, regardless of units.

For quick conversions, enter a value into any of the boxes below, and the remaining units will be calculated automatically and rounded to the fifth decimal place. Further below is a table that gives spectral ranges relevant to photonics.





Range Subrange Abbreviation eV nm cm-1 THz fs

Ultraviolet (UV) Extreme UV EUV 1240 - 12.4 1 - 100 1e7 - 1e5 3e5 - 3e3 0.00334 - 0.334
Vacuum UV VUV, UV-C 12.4 - 6.53 100 - 190 100000 - 52600 3000 - 1580 0.334 - 0.634
Deep UV DUV, UV-C 6.53 - 4.43 190 - 280 52600 - 35700 1580 - 1070 0.634 - 0.934
Mid UV UV-B 4.43 - 3.94 280 - 315 35700 - 31700 1070 - 952 0.934 - 1.05
Near UV UV-A 3.94 - 3.26 315 - 380 31700 - 26300 952 - 789 1.05 - 1.27

Visible (Vis) Violet   3.26 - 2.85 380 - 435 26300 - 23000 789 - 689 1.27 - 1.45
Blue   2.85 - 2.48 435 - 500 23000 - 20000 689 - 600 1.45 - 1.67
Cyan   2.48 - 2.38 500 - 520 20000 - 19200 600 - 577 1.67 - 1.73
Green   2.38 - 2.19 520 - 565 19200 - 17700 577 - 531 1.73 - 1.88
Yellow   2.19 - 2.10 565 - 590 17700 - 16900 531 - 508 1.88 - 1.97
Orange   2.10 - 1.98 590 - 625 16900 - 16000 508 - 480 1.97 - 2.08
Red   1.98 - 1.59 625 - 780 16000 - 12800 480 - 384 2.08 - 2.60

Infrared (IR) Near Infrared NIR, IR-A 1.58 - 0.886 780 - 1400 12800 - 7140 384 - 214 2.60 - 4.67
NIR, IR-B 0.886 - 0.413 1400 - 3000 7140 - 3330 214 - 100 4.67 - 10.0
Mid Infrared MIR, IR-C 413 - 24.8 meV 3 - 50 µm 3330 - 200 100 - 6.0 10 - 167
Far Infrared FIR, IR-C 24.8 - 1.24 meV 50 µm - 1 mm 200 - 10 6.0 - 0.3 167 - 3340

Terahertz (THz)     124 - 1.24 meV 10 µm - 1 mm 1000 - 10 30 - 0.3 33.4 - 3340





Relevant Formulas:
E = hc/λ
ν = c/λ
ṽ = 1/λ
T = 1/ν
Definitions:
E = energy (eV)
λ = wavelength (m)
ṽ = wavenumber (m-1)
T = period (s)
ν = frequency (s-1 or Hz)
h = Planck's constant = 4.135667516 x 10-15 eV*s
c = speed of light = 299792458 m/s


Handy Software:


Other Useful Calculators: