Table of Contents

Additional resources here: https://microwiki.org/wiki/index.php/Infrared

Backside analysis can include:

This page is mostly geared towards fault injection, but general imaging is also lumped here.

Fabs often thin wafers and perform backside analysis to get at the transistors without going through metal. [Functional IC Analysis] doesn't look like they thinned and they got pretty decent refsults.

Sample preparation example

Summary:

https://www.riscure.com/uploads/2017/07/ringlight_datasheet.pdf

https://link.springer.com/chapter/10.1007/3-540-36400-5_2

http://citeseerx.ist.psu.edu/viewdoc/download?doi=10.1.1.486.7647&rep=rep1&type=pdf

Simple Photonic Emission Analysis of AES

PICA

Reference systems

SS

https://www.cl.cam.ac.uk/techreports/UCAM-CL-TR-630.pdf

Hamamatsu C2741-03C + Mituotyo NIR objections on FS60Y

Halogen lamP: Gilway L6409-G has gold coating that is more IR reflective

Volodymyr Pikhur

‏ Source: https://twitter.com/vpikhur/status/973583545351335936

https://twitter.com/vpikhur/status/976998977026453504

https://twitter.com/vpikhur/status/975161177528459264 

(11:54:38 AM) vold: I know for sure tube from lamp house to trinocular prism has IR coating
(11:54:54 AM) vold: but I tried side illumination and didn't work either
(11:55:13 AM) vold: maybe prism reflects a lot of IR too

(11:58:51 AM) vold: I tried now ring illuminator and different optics
(11:59:04 AM) vold: it was great on small magnification

(12:51:32 PM) vold: I bought 3W 1064nm c-mount diode out of ebay
(12:51:52 PM) vold: https://www.ebay.com/itm/1064nm-3W-100-m-Aperture-C-Mount-Laser-Diode-/262694273052

(01:01:24 PM) vold: right now I'm using bench PSU with chinese c-mount housing
(01:02:01 PM) vold: https://www.ebay.com/itm/House-Housing-Heatsink-for-C-mount-Laser-Diode-LD-Module-33-80mm-w-Glass-Lens-/120921382858

Using CCD: https://www.ptgrey.com/chameleon-13-mp-mono-usb-2-sony-icx445-camera

Got a good high level backside image. Looks like a CSP on some random PCB

Includes:

Alphanov presentation: http://conferenze.dei.polimi.it/FDTC17/shared/FDTC%202017%20-%20session%203.1.pdf

mcmaster PoC

Notes below

mcmaster TODO: try Brainscope illuminator(s). Order another fiber if necessary

Riscure / ALpHANOV

Riscure paper

Commercial solutions include:

Sample commercial unit

With IR imaging and laser fault injection

Camera:

Camera

Excellent resource: https://github.com/cameras/camerasIR

TODO: understand what is best for this application:

mcmaster: I bought an MU800 with the intention of removing the IR filter, but then I realized it also has color filters on the pixels. Ended up using a GW CMOS camera like came with Brainscope instead

Above: “Figure 1. The electro-optical spectrum shows the relationship of the visible, short-wave infrared, mid-wave infrared and long-wave infrared wavelength bands. Also illustrated are the response curves for detectors in the visible and short-wave IR.” [SWIR IPT]

“InGaAs cameras have been replacing near-IR vidicon tubes in furnace inspection applications due to their high resolution, low lag, long lifetime, and superior signal-to-noise performance.” [SWIR IPT] Think this is primarily thermal focused though?

Above: Vidicon seems to have pretty bad efficiency in SWIR? Data is not explicitly given though. Source

Some good choices for cameras might be:

Illumination

mcmaster: I also might put silicon wafer in the imaging path to filter out the visible light. Unclear if my microscope optics can pass the IR light, say, even the relay lens. But I suppose if they have an IR filter it must pass some?. Ordering some IR lasers

mcmaster: ordered some IR LEDs. Going to try to make a ring illuminator

Optical fault injection

Basic idea: change how the circuit switches current in order to introduce a glitch. For a combinitorial circuit you probably want a CW laser to keep the glitch active. If its a CPU, you probably want a pulsed laser to trigger the glitch for a short period of time

Above: “FIGURE 3.1 Transmission spectrum of crystalline silicon from the visible to the near-IR.” (source)

In its simplest form, a CSP can be strobed with a camera flash

You need to excite the silicon with a photo of wavelength no more than 1.1 um (reference: “1234.5eV⋅nm/1.1eV is about 1100 nm. Putting 1100 back into the denominator yields 1.1 eV” (link))

Sergei paper references using 1065 nm laser. The paper shows using IR objectives. So maybe a broadband source would work okay too.

Above: silicon transmission marked with bandgap and for 980 nm laser (commonly available)

Possible sources:

2018-02-20: bought some sources:

2018-03-12

BJT emission

https://lab.whitequark.org/notes/2014-06-14/transistor-as-a-light-source/

https://twitter.com/whitequark/status/1119454148766961665

https://twitter.com/frickler01/status/1119559064164417536

References